Walking at 4/7 of its usual speed, a train is 9 minutes late. Find its usual time to cover the journey.
Solution: New speed = 4/7 of the usual speed. Let usual time be x.
.'. New time taken = 7/4 of usual time = 7x/4
so, (7x/4 ) - x = 9 min.
=> 3x = 36
=> x = 12 min.
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