Practice Quiz

SAT Math

Category - Algebra and Functions

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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?
  1. 48 km/h
  2. 72 km/h
  3. 75 km/h
  4. 78 km/h
  5. 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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