A train 280 m long is moving at 60 kmph. The time taken by the train to cross a tunnel 220 m long, is

20 sec 25 sec 30 sec 35 sec

30 sec

Speed in m/s = 60 x \(\frac{5}{18}\) = \(\frac{50}{3}\) m/s Speed = \(\frac{ Distance}{ Time}\) \(\frac{50}{3}\) = \(\frac{ \text{280 + 220}}{ Time}\) \(\frac{50}{3}\) = \(\frac{500}{ Time}\) Time = \(\frac{\text{500 x 3}}{ 50}\) Time = 30 seconds