Excluding stoppages, the speed of a bus is 50 kmph and including stoppages, it is 42 kmph. For how many minutes does the bus stop per hour?	Choose the correct choice from the following answers:
A) 10 min
B) 7 min
C) 8.2 min
D) 9.6 min
E) 40 min

Rationale: "d 9.6 min due to stoppages , it covers 8 km less . time taken to cover 9 km = ( 8 / 50 x 60 ) min = 9.6 min"
Answer: D