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。。。作者: jiuwang 时间: 2010-6-20 07:09
1/x-2/3600=1/75 算出来是72
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