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?
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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