Excluding stoppages, the speed of a bus is 50 km/hr and including stoppages, it is 36 km/hr. For how many minutes does the bus stop per hour?  Select the correct option.
A) 118 min
B) 10 min
C) 18 min
D) 16 min
E) 15 min

Rationale: "due to stoppages , it covers 14 km less . time taken to cover 14 km = 14 / 50 * 60 = 16 min . answer : d"
Answer: D