Without stoppages, a train travels certain distance with an average speed of 400 km/h, and with stoppages, it covers the same distance with an average speed of 360 km/h. How many minutes per hour the train stops ?	Choose the correct choice: A) 3 B) 4 C) 5 D) 6 E) 7

Rationale: "due to stoppages , it covers 40 km less . time taken to cover 40 km = 40 â  „ 400 h = 1 â  „ 10 h = 1 â  „ 10 ã — 60 min = 6 min answer d"
Answer: D