Question

一道英语奥数题请帮忙

Zhang Hua and Li Ming were running along a circle.They started(出发) from the same starting poing(点) but in the opposite directions(相反方向).When they meet again.Zhang Hua had run for 250M but Li Ming only 150M.The two boys ran at the same speed (速度) along the circle.When Zhang Hua arrived(到达) at the starting point again.how many meters are left(被剩下) for Li Ming to run to get to the starting point again?

Answer 1

相同的速度感觉有歧义
如果相遇后张跟李是用一样的速度X跑，那最后剩下的应该是（250-150）=100M
如果相遇后张跟李是用跟原来相同的速度跑，那最后剩下的距离应该是（250-150*150/250）=160M

Answer 2

100
两个人速度一样 路程还不一样 只可能Z先跑了100m 然后L才跑
这样Z跑了250m L跑了150m
显然圆的周长是400m
因为速度一样 所以Z后来又跑了150m L也跑了150m
也就是Z后来跑了L之前跑的长度 L后来跑了Z之前跑的长度
所以L还差100m到终点