I'm posting one puzzle, riddle, math, or statistical problem a day. Try to answer each one and post your answers in the comments section. I'll post the answer the next day. Even if you have the same answer as someone else, feel free to put up your answer, too!
Tuesday, December 16, 2008
Four Way Stop
Four cars come to a four way stop, all coming from a different direction. They can't decide who got there first, so they all go forward at the same time. They do not crash into each other, but all four cars go. How is this possible?
If A is opposite to B, and C opposite to D, A and B turn to the right (in countries with right-hand traffic) or to the left (in countries with left-hand traffic), and C and D either go straight on or turn also to the right (or to the left respectively).
All cars could drie straight if the East and West facing cars move very slowly while the North and South cars get through the intersection quickly (or vice-versa).
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If A is opposite to B, and C opposite to D, A and B turn to the right (in countries with right-hand traffic) or to the left (in countries with left-hand traffic), and C and D either go straight on or turn also to the right (or to the left respectively).
ReplyDeleteI think you figured out all the possibilities, Johanna. I would have just talked about everyone going right (or left) and left it at that.
ReplyDeleteeach car turns right
ReplyDeleteAll cars could drie straight if the East and West facing cars move very slowly while the North and South cars get through the intersection quickly (or vice-versa).
ReplyDelete