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. |