Excluding stoppages, the speed of a train is 54 kmph and including stoppages it is 40 kmph. Of how many minutes does the train stop per hour?
Choose the correct answer:	A) 13.55	B) 14.55	C) 15.55	D) 16.55	E) 17.55

Rationale: "explanation : t = 14 / 54 * 60 = 15.55 answer : option c"
Answer: C