Excluding stoppages, the speed of a bus is 60 kmph and including stoppages, it is 45 kmph. For how many minutes does the bus stop per hour?	Select the correct option:	A) 10 min	B) 12 min	C) 18 min	D) 20 min	E) 15 min

Rationale: "due to stoppages , it covers 15 km less . time taken to cover 15 km = ( 15 / 60 x 60 ) min = 15 min answer : e"
Answer: E