A train crosses a 210 m platform in 30 s and a man walking on that platform in the direction opposite to the train at 5.4 km/h in 15 s. What is the length of the train?

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Accepted Answer

255 m. Man = 1.5 m/s, coming towards the train. L+210=30v and L=15(v+1.5). So 15v+22.5+210=30v → v=15.5 m/s and L=15×17=255 m. Check: 255+210=465=30×15.5. (210 m ignores the man; 165 m treats him as walking with the train.)

A train crosses a 210 m platform in 30 s and a man walking on that platform in the direction opposite to the train at 5.4 km/h in 15 s. What is the length of the train?

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