How much time will a train of length 171 metres take to cross a tunnel of length 229 metres, if it is running at a speed of 30 km/hr?A1 minuteB36 secondsC30 secondsD48 secondsAnswer: D. 48 seconds Read Explanation: Correct answer is 48 seconds. distance to be travelled = 171+229 = 400 m Speed=30km/hr 30x5/18 = 150/18 = 25/3 m/sec Time = distanse / speed = 400 x 3/25= 48 secondsRead more in App