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How long will a train of 600m traveling at 64 kmph take to cross a cyclist traveling at 8 kmph in opposite direction to it? (in seconds)

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answer is D.

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Detailed Solution

d = 600m.

speed = 64kmph + 8kmph = 72kmph

Time = $\frac{d}{s} = \frac{600}{72 \times \frac{5}{18}} = \frac{600}{70} \times \frac{18}{5} = 30 s e c$

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