A 240-m long train crosses a 360-m long tunnel in 30 seconds. What is the speed of the train (in km/h) ?

72 43.2 60 28.8

72

Total Distance = 240 + 360 = 500m Time takenn = 30 sec Speed = \(\frac{Distance }{Time}\) = \(\frac{500 }{30}\) = \(\frac{50 }{3}\) m/sec X m/sec = X × \(\frac{18 }{5}\) km/h = Y km/h \(\frac{50 }{3}\) × \(\frac{18 }{5}\) = 72 km/h