1.

A man can row 8 kmh-1 in still water. If the river is running at 6 kmh-1, he takes 6 hours more to go upstream than downstream for the same distance. Find the distance.

Answer»

14 km



SPEED UPSTREAM= 8 - 6 = 2 kmh-1 
Speed downstream = 8 + 6 = 14 kmh-1 
Now, x/2 - x/14 = 6
or, 7x - x/14 = 6
∴ x = 14 km



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