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SAT Prep

Category - Math

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A train travels the distance between two stations in 5 hours, traveling at an average speed of 60 km/h. What must be the average speed of the train in order to travel the same distance in 4 hours?

48 km/h
72 km/h
75 km/h
78 km/h
84 km/h

Explanation

Answer: C - The average speed of the train must be 75 km/h. Speed and time vary inversely.
60:x = 4:5
4x = 5 × 60
x = (5 × 60)/4 = 5 × 15 = 75

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