1) 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 ? A) 15 min B) 20 min C) 10 min D) 25 min E) 18 min Answer: Option CExplanation:Due to stoppages, it covers 9 km less. Time taken to cover 9 km $=\left(\frac{9}{54}\times 60\right)$ min = 10 min
