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What is the ratio of relative speed of two trains when travelling in the same direction versus opposite directions?

1. 1:5
2. 1:8
3. 1:10
4. 2:11

Correct answer: 1:10

Solution

For trains with speeds S1 and S2 (S1>S2): Same direction relative speed=S1-S2. Opposite direction=S1+S2. For the given speeds in the original problem, ratio=(S1-S2):(S1+S2)=1:10.

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