A train covers a certain distance at a speed of 45 m/s in 15 minutes. How much time it will take to cover the same distance at the speed of 60 m/s?
Given, Speed of the train = 45 m/sec
Time taken to cover a certain distance = 15 minutes = 15*60 = 900 seconds
Then, Distance travelled by the train = 45*900 = 40500 m
New speed = 60 m/sec
Then, Time taken to travel 39500 m = $$\dfrac{40500}{60} = 675$$ seconds = $$\dfrac{675}{60} = 11.25$$ minutes
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