Dr B Ching says that a train travelling at an average speed of 50 mph can complete a journey in 3 hours. How long will it take a high-speed train travelling at an average speed of 150 mph to complete the same journey?
A. 36 min
B. 40 min
C. 45 min
D. 1 hour
E. 80 min
D. 1 hour
The first train, travelling at 50 mph will travel 150 miles in three hours.
So the high speed train, at 150 mph, will take one hour.
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