# A-Train 100 M Long Travelling At 40 M/S Starts Overtaking Another Train 200 M Long Travelling At 30 M/S. The Time Taken By The First Train To Pass The Second Train Completely Is:

Relative velocity of overtaking = 40 – 30 = 10m/s

Total relative distance covered with this relative velocity during overtaking

= 100 + 22 = 300m

So, time taken =$$\frac{300}{10} = 30s$$

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