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Excluding stoppages, the average speed of a bus is 54 kmph and including stoppages, it is 45 kmph. For how many minutes does the bus stop per hour?

Correct answer: B. 10

  • A. 9
  • B. 10
  • C. 12
  • D. 20

Explanation

In one hour, the bus covers 45 km including stoppages, while its running speed is 54 kmph. Running time is 45 km ÷ 54 kmph = 5/6 hour = 50 minutes, so stoppage time is 60 - 50 = 10 minutes per hour. The likely choice is a, 9 minutes, from subtracting 45 from 54 without converting the result into time.

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