A train with 90 kmph crosses a bridge in 36 s. Another train 100 m shorter crosses the same bridge at 45 kmph. The time taken by the second train to cross the bridge will be
Question and options
A train with 90 kmph crosses a bridge in 36 s. Another train 100 m shorter crosses the same bridge at 45 kmph. The time taken by the second train to cross the bridge will be
- 60 s
- 64 s
- 68 s
- 72 s
Answer and explanation
Correct answer: B - 64 s
At 25 m/s for 36 s, train + bridge = 900 m. The second train + bridge = 800 m at 12.5 m/s, which takes 64 s.
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