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Velocity(Speed with Direction)

Two trains st...

Question

Two trains start from the same station at $11. p . m$ in opposite direction at speeds of $72 k m / h$ and $63 k m / h$ , respectively. At what time they will be $810 k m$ apart?

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Solution

Consider the following question.
$T i m e = \frac{R e l a t i v e D i s t a n c}{R e l a t i v e V e l o c i t y}$
$= \frac{(810 k m)}{(72 k m p h + 63 k m p h)}$
$= 6 h o u r s$
They’ll be $810 k m$ from start. $6 h r$
In other words, they’ll be $810 k m$ apart at $05 : 00 P M$

Hence, this is the required answer.

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