GWD-8-28

lindaaniu · 发表于 2010-5-29 18:41:47

Q28:
A car traveling at a certain constant speed takes 2 seconds longer to travel 1 kilometer than it would take to travel 1 kilometer at 75 kilometers per hour. At what speed, in kilometers per hour, is the car traveling?

A.   71.5
B.   72
C.   72.5
D.   73
E.   73.5
Answer: B

为什么我算不出正确答案。。。

tylerwfj · 发表于 2010-5-29 19:30:20

1/x-2/3600=1/75 算出来是72

GWD-8-28

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