Two trains, each $50 \,m$ long are travelling in opposite direction with velocity $10 \,m/s$ and $15 \,m/s$. The time of crossing is...........$s$
Two trains, each $50 \,m$ long are travelling in opposite direction with velocity $10 \,m/s$ and $15 \,m/s$. The time of crossing is...........$s$
$2$
$4$
$2\sqrt 3 $
$4\sqrt 3 $
Two trains, each $50 \,m$ long are travelling in opposite direction with velocity $10 \,m/s$ and $15 \,m/s$. The time of crossing is...........$s$
Time $ = \frac{{{\rm{Total\, length }}}}{{{\rm{Relative\, velocity }}}} = \frac{{50 + 50}}{{10 + 15}} = \frac{{100}}{{25}} = 4\;sec$
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