Problems on Trains · Question 23 · Medium
Problems on Trains question 23
A man sitting in a train moving at 45 km/h notices that a 280 m long goods train going in the opposite direction takes 8 seconds to pass him. What is the speed of the goods train?
- 90 km/h
- 81 km/h
- 35 km/h
- 126 km/h
Answer and explanation
Answer: B. 81 km/h
Explanation: Relative speed = 280 ÷ 8 = 35 m/s = 35 × 18/5 = 126 km/h. Since they move in opposite directions, the goods train's speed = 126 − 45 = 81 km/h.
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