The average speed of a train, including stoppages was 40 km/hr and excluding stoppages, it was 50 km/hr. How many minutes per hour did the train stop?

A) 12
B) 20

C) 18
D) 16

Correct answer:
A) 12

Description for Correct answer:
Stoppage = \( \Large \frac{Difference \ of \ two \ speeds}{Faster \ speed} \times 60 min/hr \)

= \( \Large \frac{50-40}{50} \times 60 \) = 12 min/hr

Please provide the error details in above question

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