A 240 m train crosses a 360 m bridge in 30 seconds. A second train half as long, running at three-fourths of the first train's speed, crosses the same bridge in how long?

Question

Accepted Answer

32 s. First train: 600/30=20 m/s. Second train: 120 m long at 15 m/s; distance =120+360=480 m → 480/15=32 s. (40 s keeps the 240 m length.)

A 240 m train crosses a 360 m bridge in 30 seconds. A second train half as long, running at three-fourths of the first train's speed, crosses the same bridge in how long?

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