Question

Two train start from the same station at 11p.m in opposite directions at speed of 72 km/h and 63 km/h, respectively. At what time they will be 810 km apart ?

Answer 1

$\boxed{\bold{\large{Answer:}}}$

$\text{We\:know\:that,}$

$Time = \frac{Relative Density}{Relative Velocity } \\ \\ \implies \frac{810}{72 + 36} \\ \\ \implies6 \: Hours$

$\text{So,\:The\:trains\:will\:be\:810km\:apart\:after\:6\:hours\:from\:start}$

$\text{Thus,\:The\:trains\:will\:be\:810km\:apart\:at\:5am}$

$\boxed{\bold{\large{Hope\:it\:helps\:you!}}}$

Answer 2

HEY MATE HERE IS YOUR ANSWER

____________________________

Given :-

Speed :- 72 km/h and 63 km/h

$\rule {135} {2}$

We know that,

$\huge = > \: \frac{Relative \: density}{Relative \: velocity}$

$\huge = > \frac{810}{72 + 36}$

$= > 6 \: hours$

Therefore the train will be 810 km apart after 7 hours.

$\rule {135} {2}$

Hope it will help you

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