First slide
Relative motion based problems
Question

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?

Easy
Solution

\large T = \frac{{sum\;of\;Lengths\;of\;two\;trains}} {{Magnitude\;ofrelative\;velocity}}
\large = \frac{{\left( {50 + 50} \right)m}} {{(10 + 15)m/s}} = 4\sec

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