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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?

9
10
12
20
Explanation:

Due to stoppages, it covers 9 km less.

Time taken to cover 9 km =$ \left(\dfrac{9}{54} \times 60\right) $min= 10 min.
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