[問題] 請教一題PP數學!
A hiker walking at a constant rate of 4 miles per hour is passed by a cyclist t
raveling in the same direction along the same path at a constant rate of 20 mil
es per hour. The cyclist stops to wait for the hiker 5 minutes after passing h
er, while the hiker continues to walk at her constant rate. How many minutes m
ust the cyclist wait until the hiker catches up?
(A)
(B) 15
(C) 20
(D) 25
(E)
網路download的版本沒有A和E
答案是C 20
但我算的是D 25
可否麻煩高手指點迷津
感恩^^
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