Without stoppages, a train travels certain distance with an average speed of 250 km/h, and with stoppages, it covers the same distance with an average speed of 125 km/h. How many minutes per hour the train stops ?	Choose the correct choice from the following
A) 25  B) 30  C) 35  D) 40  E) 45

Rationale: "due to stoppages , it covers 125 km less . time taken to cover 125 km = 125 â  „ 250 h = 1 â  „ 2 h = 1 â  „ 2 ã — 60 min = 30 min answer b"
Answer: B