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. |