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Excluding stoppages, the 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: C. 10

  • A. 12
  • B. 11
  • C. 10
  • D. 9

Explanation

In one hour, the bus covers 45 km including stoppages, while its running speed is 54 km/h. Its actual running time is 45 km / 54 km/h = 5/6 hour = 50 minutes, so it stops for 60 - 50 = 10 minutes per hour. The likely wrong choice is 12 minutes, obtained by treating the speed difference of 9 km/h directly as 9 minutes.

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