Excluding stoppages, the speed of a train is 48 kmph and including stoppages it is 32 kmph. Of how many minutes does the train stop per hour? Choose the correct answer:
A) 40 B) 30 C) 20 D) 10 E) 5

Rationale: "explanation : t = 16 / 48 * 60 = 20 answer : option c"
Answer: C