Excluding stoppages, the speed of a bus is 60 kmph and including stoppages, it is 50 kmph. For how many minutes does the bus stop per hour?  Choices.
A) 10 min  B) 15 min  C) 12 min  D) 8 min  E) 16 min

Rationale: "due to stoppages , it covers 10 km less . time taken to cover 10 km = ( 10 / 60 x 60 ) min = 10 min answer : a"
Answer: A