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How many seconds will a 500 metre long train take to cross a man walking with a speed of 3 km/hr in the direction of the moving train if the speed of the train is 63 km/hr?

25
30
40
45
Explanation:

Speed of the train relative to man = (63 - 3) km/hr
= 60 km/hr
=$ \left(60 \times\dfrac{5}{18} \right) $m/sec
=$ \left(\dfrac{50}{3} \right) $m/sec.
$\therefore$ Time taken to pass the man =$ \left(500 \times\dfrac{3}{50} \right) $sec
= 30 sec.
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