4 hrs after a goods train passed a station, another train travelling at a speed of 60 km/hr following that goods train passed through that station. If after passing the station the train overtakes the goods train in 8 hours. What is the speed of the goods train?
Let the speed of goods train = $$x$$ km/hr
Speed of another train = 60 km/hr
Distance between the two trains = $$60 \times 4 = 240$$ km
The trains are moving in same direction, => Relative speed = $$(60 - x)$$ km/hr
Time = 4 + 8 = 12 hours
=> speed = distance/time
=> $$60 - x = \frac{240}{12} = 20$$
=> $$x = 60 - 20 = 40$$ km/hr
=> Ans - (A)
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