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  4. Two trains are each 50m long moving parallel towards each other at speeds 10 m/s and 15 m/s respectively, at what time will they pass each other

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Q. Two trains are each 50m long moving parallel towards each other at speeds 10 m/s and 15 m/s respectively, at what time will they pass each other

Motion in a Straight Line

Solution:

As both the trains are moving in the opposite direction, the relative speed of each train with respect to each other be, $v =10+15=25 m / s$

Here distance covered by each train $=$ sum of their lengths $=50+50=100 m$
$\therefore$ Required time $=\frac{100}{25}=4 sec$