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A bus completed the first 50 miles of a 120-mile trip at an average speed of 20 mph. Then it took a halt of 30 minutes

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A bus completed the first 50 miles of a 120-mile trip at an average speed of 20 mph. Then it took a halt of 30 minutes

by VJesus12 » Wed Jun 02, 2021 10:40 am

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A bus completed the first 50 miles of a 120-mile trip at an average speed of 20 mph. Then it took a halt of 30 minutes and completed half of the remaining journey at an average speed of 35 mph. At what average speed it should complete the remaining journey so that the overall average speed of the whole journey becomes 20 mph?

A. 40 mph
B. 35 mph
C. 30 mph
D. 22.5 mph
E. 17.5 mph

Answer: E

Source: e-GMAT
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