Excluding stoppages, the speed of a train is 45 kmph and including stoppages it is 31 kmph. Of how many minutes does the train stop per hour?
Pick one
A) 18.6
B) 27
C) 12
D) 121
E) 28

Rationale: "explanation : t = 14 / 45 * 60 = 18.6 answer : option a"
Answer: A