A train has to cover a distance of 120 km in 10 hours. If it covers half journey in 3/5th time, then the speed of covering the remaining distance in the time left has to be:
Speed = Distance/time = 120/10 = 12 km/hr According to the question, New time = 3/5 x 10 = 6 hrs New distance = 1/2 x 120 = 60 km Required speed = Distance left/Time left = 60/4 = 15 km/hr