# Aptitude - Aptitude- Speed

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A man covered a certain distance at some speed. Had he moved 3 kmph faster, he would have taken 40 minutes less. If he had moved 2 kmph slower, he would have taken 40 minutes more. The distance (in km) is ?

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A man can row 9 and 1/3 kmph in still water and finds that it takes him thrice as much time to row up than as to row, down the same distance in the river. The speed of the current is ?

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Let speed upstream is x kmph.
Then, speed downstream = 3x kmph.
Speed in still water = (1/2)(3x + x) kmph = 2x kmph.
2x = 28/3 x = 14/3
Speed upstream = 14/3 km/hr, Speed downstream 14 km/hr.
speed of the current = (1/2)[14 - (14/3)] = 14/3 = 4 and 2/3 kmph

If a man can swim downstream at 6 kmph and upstream at 2 kmph, his speed in still wateris ?

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Speed in still water = (1/2) * (6 + 2) km/hr = 4 km/hr

A boat covers 24 km upstream and 36 km downstream in 6 hours while it covers 36 km upstream and 24 km downstream in 6 hours. The velocity of the current is ?

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A man can row a boat at 10 kmph in still water. If the speed of the stream is 6 kmph, the time taken to row a distance of 80 km down the stream is?

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