Question

How much time will a train take to cross 229m tunnel if it runs at a speed of 30 km/hr?

Answer 1

f the train is running 45 kmph, it covers 45000 m in 60 minutes, so it will take 900*60/45000 = 1.2 minutes. Total distance covered by the train while crossing= 180 m + 540 m= 720 metres. Its speed= 45 km/hr= 12.5 m/s. Therefore it'll take the train 57.6 seconds to cross the tunnel.