A train of length 150 m takes 40.5 seconds to cross a tunnel of length 300 m. The speed of the train (in km/hr) is

40

Speed = \(\frac{ Distance}{ Time}\)

Speed in km/hr will be calculated as follows:

Speed =  \(\frac{\text{150 + 300}}{ 40.5}\) x \(\frac{18}{5}\)

Speed = \(\frac{\text{450}}{ 40.5}\) x \(\frac{18}{5}\)

Speed = \(\frac{\text{8100}}{ 202.5}\)

Speed = 40 km/hr