A train 280 m long, running with a speed of 63 km/hr will pass an electric pole in :

20 sec 16 sec 15 sec 18 sec

16 sec

Speed = \(\frac{ Distance}{ Time}\) 63 x \(\frac{ 5}{ 18}\) =  \(\frac{ 280}{ Time}\) \(\frac{ 315}{ 18}\) = \(\frac{ 280}{ Time}\) Time = \(\frac{\text{280 Χ 18} }{ 315}\) Time = 16 sec