Trains P and Q are moving on parallel tracks in the same direction. Train P crosses train Q completely in 60 seconds and a passenger in train P crosses train Q in 40 seconds. If the speeds of trains…
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Trains P and Q are moving on parallel tracks in the same direction. Train P crosses train Q completely in 60 seconds and a passenger in train P crosses train Q in 40 seconds. If the speeds of trains P and Q are in the ratio 2 : 1, then calculate the ratio of their lengths (P : Q)?
- 3 : 4
- 1 : 2
- 3 : 1
- 3 : 2
Answer and explanation
Correct answer: B - 1 : 2
The speeds are and , so the relative speed is . A passenger on P passes Q's whole length in 40 s, so . P passes Q completely in 60 s, so and . .
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