Question 80

9 hrs after a goods train passed a station, another train travelling at a speed of 72 km/hr following that goods train passed through that station. If after passing the station the train overtakes the goods train in 3 hours. What is the speed of the goods train?

Solution

Let the speed of goods train = $$x$$ km/hr

Speed of another train = 72 km/hr

Distance between the two trains = $$72 \times 9 = 648$$ km

The trains are moving in same direction, => Relative speed = $$(72 - x)$$ km/hr

Time = 9 + 3 = 12 hours

=> speed = distance/time

=> $$72 - x = \frac{648}{12} = 54$$

=> $$x = 72 - 54 = 18$$ km/hr

Share on Whatsapp Share on Whatsapp

Create a FREE account and get: