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What was theaverage speed?

智力题 2017-04-09 英语智力题 网络整理

  A car traveled from A to B in 30 minutes. The first half of the trip was covered at 50 mph, and the second half at 60 mph. What was the average speed?

  A.400/11

  B.500/11

  C.600/11

  D. 700/11

答案:600/11 英里,这是一道计算题,我们设平均时速为 X,则0.25X/50+0.25X/60=0.5 ,进而可得 X=600/11 ,因此该选 600/11。

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