Final distance=initial distance + Avg Velocity*time Initial distance of NY train (X1)=0 Avg Velocity of NY train (V1)=15mph LA train distance (X2)=5000 V2= -20 mph (negative going opposite of the bird) If you make the two equal each other, you'll find the time they collide. 0+ (15 mph*T)=5000 + (-20 mph*T) 35T=5000 T= 142.857 hrs Once they collide, there's no distance for the fly to travel, so the bird will have 142.857 hours to fly. Assuming the bird has no inertia and a constant speed, the total distance the bird travels is 25 mph times 142.857 hours. 3571.43 miles It's somewhat nice to use physics outside of class...
No, it can't be correct because of that. The riddle's saying that each person can only see one other hat, the hat in front of him. Like the first white can't see anything, the second black can see the first white...etc. I'm guessing that the whole line is facing left?
Damn, you know what? I think Martian got the BW hat one...I misunderstood the riddle. His solution makes sense.
I ended up googling it and the solution had an element of what I was thinking (that you need to designate one switch to be the only one that matters and that you need to designate one person to be the one that determines when to make the announcement) but I could not have come up with the exact solution myself. The solution I found definitely works, though. Pretty clever riddle.
Exactly what I was thinking. Please leave the math and physics problems to yourself and post some actual freaking riddles, not your homework.
The calculations can be done by a 6th grader. It's hardly advance level mathematics/physics. The trick is understanding that time is an unchanging variable. Many high school students can't figure it out because it requires thinking outside of the box. And thinking outside the box is the definition of a riddle.
Here's another "math" riddle for you guys. you have two ropes, each of which takes one hour to burn completely. both of these ropes are nonhomogeneous in thickness, meaning that some parts of the ropes are chunkier than other parts of the rope. using these nonhomogeneous ropes and a lighter, time 45 minutes. Note: Some clarification on what is meant by nonhomogeneous. For instance, maybe a particular section of rope that is 1/8 of the total length is really chunky, and takes 50 minutes to burn off. then it would take 10 minutes to burn off the remaning 7/8, since we know that the whole rope takes an hour to burn off. that's just an example; we don't know any such ratios beforehand. The point is, if you look at one of your ropes and cut it into pieces, you have no clue how long any individual piece will take to burn off.
I've got a riddle. Who is Martian Man, or rather, who was his previous incarnation on the BBS? Why is he posting 25 times a day? Seemingly, mostly posting in this riddle thread?
Light rope A at one end and rope B at both ends. When rope B completely burns up (in 30 minutes), light the unlit end of rope A. It'll completely burn up in 15 minutes, for a total of 45 minutes. SamCassell: If forced to guess, I'd say it had something to do with some kind of road that we don't have in Tennessee.
Yeah, I got up to the part of the scorekeeper. A very nice riddle. Here's a sadistic time waster.... Several of the churches in town are holding fundraising events on Saturday, for a variety of causes. Where is each church, what event is it putting on and which cause is it in aid of? GIVEN: Churches: St. Andrew's St. Helena's St. John's St. Lucy's St. Stephen's Location: Broadwalk Oakdale Rd Park View Sussex Place Walton St Event: Art Show Choir Concert Craft Sale Fete Square Dance Cause for aid: Hospice Missionaries New Roof Refugees Spire CLUES: 1. St. Stephen's, which isn't the one that's holding a square dance on Saturday evening, is raising money for the local hospice; the craft sale is being held at a church dedicated to a female saint. 2. St. Helena's Church is in Oakdale Road, but St. John's isn't in Sussex Place; St. Andrew's, where the art show is being held, is neither the church in Sussex Place nor the one raising funds for repairs to it's spire. 3. The church in Walton Street is trying to get money for a much needed new roof, and the one in Park View is holding a fete; the church which is raising money for refugees with a choir concert is not St. Lucy's, nor is it in Broadwalk. Good Luck!
#3. You eliminate #4 because he's basically useless and that leaves #1, #2 and #3. #3 sees a White Hat and a Black Hat. That leaves one of each left to be determined. So #3 has a 50/50 shot of getting it right
i think your riddle actually misses the part where each guy gets to turn his head from side to side. that gives a more definite answer to which the #2 guy would know since he sees that #1 and #3 has a white hat on so he can deduce he has on a black hat.
i'll take a stab at this.... The guys flip one switch..say switch A. Since there's 23 guys, that means that no matter where switch A started, the switch has to end at the opposite position. Example: Switch A starts out at the 'off' position. and so it begins... guy # switch position 1. on 2. off 3. on 4. off 5. on 6. off 7. on 8. off 9. on 10. off 11. on 12. off 13. on 14. off 15. on 16. off 17. on 18. off 19. on 20. off 21. on 22. off 23. on what Switch B is there for is to nullify any 'unwanted' data...like repeats. if guy # 1 switches the switch from 'off' to 'on' and the guard tells him to come back again, he'll switch Switch B instead of Switch A. essentially when all 23 guys are in the room, they will have to # themselves off on what 'assignment' they have. like guy #1 will switch it off if Switch A is initially on and vice versa. what if guy #7 (assignment= switch off) goes after guy #21 (assignment=switch off)? then he would see that #21 switched it off so he would have to switch Switch B to perserve the pattern. something like this?
Does "nor the one raising funds for repairs to its spire" in part 2 mean that that and the church in Sussex place are not the same church? If so, then I think I have it... if not, then it doesn't seem solvable. St. Helena's - Oakdale - Choir - Refugees St. Andrew's - Walton - Art - Roof St. Stephen's - Parkview - Fete - Hospice St. Lucy's - Sussex - Crafts - Mission St. John's - Broadwalk - Square Dance - Spire if someone hasn't already posted this. Thanks for helping me put off my real work.
