CMA Foundation · Fundamentals of Business Mathematics and Statistics · Time and Distance
A train 200 m long crosses a platform 250 m long in 30 seconds. What is the speed of the train in km/h?
The speed is 54 km/h. To cross the platform the train covers its own length plus the platform length, 450 m, in 30 seconds. That is 15 m/s, and multiplying by 18/5 converts it to 54 km/h.
- A48 km/h
- B54 km/hCorrect
- C60 km/h
- D66 km/h
Explanation
Distance covered = 200 + 250 = 450 m in 30 s, so speed = 15 m/s. Converting, 15 × 18/5 = 54 km/h. Using only 250 m would give 25 m/s = 30 km/h... and using only 200 m gives 24 km/h, both wrong.
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