A train travels at a certain average speed for a distance of 63 km and then Travels a distance of 72 km at an average speed of 6 km more than the original speed if it takes 3 hours to complete the total journey what is its original average speed
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then time taken to travel 63km = 63/X h
New speed = (x+6) km/h
time taken to travel 72km (x+6) h
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