英文数学问题~~~~

来源：百度知道 编辑：UC知道 时间：2024/06/15 06:33:22
two cyclists,20 km apart start towards each other along a straight road,each cycling at a steady 10 km/hour.A bird released by one of the cyclist,files back until it meets the second cyclist.It turns immediately,and files back until it meets the first and continue doing this process until the two cyclist meet.what is the total distance flown by the bird?
那个鸟的速度是20m/hr .
确定是20km吗?有人说是10km....

鸟会一直飞直到两个人见面。
两个人每人速度10KM/HR，20km/(10km/hr+10km/hr)=1hr
20m/hrx1hr=20m
注：是km吧，20km,
有问题找我。

这是电影《美丽人生》里的提到的题目，Flies还打错了

A condition is missing. We still need the bird's speed.
total distance flown by the bird = time x bird's speed
time = 20 km /(10+10) = 1 hour
so the distance = bird's speed x 1 hour.