1.

A train covers a certain distance. Had it moved 4 kmh"1 faster, it would have taken 1.5 hrs less. If it had moved 6 kmh'1 slower, it would have taken 3 hrs more. What is the distance the train covers

Answer»

540 km



Let the DISTANCE be D and SPEED is V 
D/V+4 = D/V - 1.5
∴ D/V+4 = D/V - 3/2


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