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5 May, 04:35

A pilot flew a jet from City A to City B, a distance of 2400 mi. On the return trip, the average speed was 20% faster than the outbound speed. The round-trip took 6 h 40 min. What was the speed from City A to City B?

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  1. 5 May, 06:18
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    Let the velocity be Va for outbound journey and 1.2 Va for return journey.

    Total time taken = 2400 / Va + 2400 / 1.2 Va

    2400 / Va + 2400 / 1.2 Va = 20 / 3 h

    1 / Va (2400 + 2000) = 20 / 3

    4400 / Va = 20/3

    Va = 4400 x 3 / 20 = 660 mi / h
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