Practicing Success
A 200 meter train takes 15 sec to cross a man who is walking in the same direction at the speed of 4 km/hr. The speed of the train is: |
48 km/hr 60 km/hr 52 km/hr 55 km/hr |
52 km/hr |
Let the speed of the train be x km/hr The relative speed of the train with respect to the man = (x - 6) km/hr ⇒ (x - 4) = \(\frac{200}{15}\) × \(\frac{18}{5}\) (converting m/s to km/hr by multiplying with x\(\frac{18}{5}\)) ⇒ (x - 4) = 40 × \(\frac{6}{5}\) ⇒ x - 4 = 48 x = 52 Ans = 52 km/hr |