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Q 2236867772. Duronto express left for Mumbai, increasing its speed in each hour. It started its journey from Howrah, but after four hours of its journey it met with an accident. Its speed in the fourth hour was 7/5 times that of the third hour and the speed in the third hour was 10/7 times that of the second hour and in the second hour it was 7/5 times that of the first hour. If it would have travelled with the half of the speed that of the third hour, then it would have gone 160 km less in the same time, (i.e., four hours). The average speed of the train during the journey of 4 hours was:

IBPS-PO 2017 Mock Mains