Excluding stoppages, the speed of a bus is 86 kmph and including stoppages, it is 76 kmph. For how many minutes does the bus stop per hour?  Choose the correct choice from the following answers.
A) 7.5 min B) 16 min C) 20 min D) 7 min E) 40 min

Rationale: "d 7 min due to stoppages , it covers 10 km less . time taken to cover 10 km = ( 10 / 86 x 60 ) min = 7 min"
Answer: D