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

1. 9
2. 10
3. 12
4. 20

Correct answer: 10

Solution

In 1 hour including stoppages, the bus covers 45 km. At 54 km/h without stoppages, covering 45 km would take 45/54 = 5/6 hour = 50 minutes. So the bus stops for 10 minutes per hour.

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