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?
A) 21.6 km/hr B) 27 km/hr C) 18 km/hr D) 14.4 km/hr
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18. GQ
Step-by-step explanation:
let speed of goods train = x km/hr
distance travelled in 9hr = 9x
relative speed =( 72 - x )
(72 - x)× 3 = 9x => x = 18 km/hr
option(C) is correct
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