GWD一题

Xiaotongdi · 发表于 2011-10-10 16:23:14

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
本来不想去想的了，可是想不到很不爽。怎么算出来72呢？

jeffxu · 发表于 2011-10-10 16:32:02

75km/h, 1 km => t = 48 seconds

So the car takes 50 seconds to travel 1 km. speed = 75*48/50=72

Xiaotongdi · 发表于 2011-10-10 16:37:22

thanks so much！

半阙 · 发表于 2011-10-10 17:15:56

也可以这样做：1/v=1/75+1/1800 算出来v=72
注：1/1800即2s换算成hour的~

Xiaotongdi · 发表于 2011-10-10 17:39:59

恩恩，这种更简单！

GWD一题

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