Excluding Stoppages, The Speed Of A Bus Is 54 Kmph Amd Including Stoppages, It Is 45 Kpmh. For How Many Minutes Does The Bus Stop Per Hour?

Question: Excluding Stoppages, The Speed Of A Bus Is 54 Kmph Amd Including Stoppages, It Is 45 Kpmh. For How Many Minutes Does The Bus Stop Per Hour?
a. 7
b. 10
c. 15
d. 22