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A boat moves upstream at the rate of 1 km in 20 minutes and down stream 1 km in 12 minutes. The speed of the current is :

6.5kmph
8 kmph
1 kmph
2 kmph
Explanation:
Speed upstream = 1 km in 20 minutes.
So the upstream speed in km per hour = (1 / 20) * 60 = 3 km/hr
Speed downstream = 1 km in 12 m
So the downstream speed in km per hour = (1 / 12 )* 60 = 5 km/hr
Therefore speed of the current = (5 - 3)/2 km/hr = 1 km/hr
Additional Questions

A man can row a boat at 10 kmph in still water and the speed of the stream is 8 kmph. What is the time taken to row a distance of 90 km down the stream ?

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If athul rows 16 km upstream and 24 km down steam taking 4 hours each, then the speed of the stream

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A man rows to a place 48km distant and back in 14 hours. He finds
that he can row 4km with the stream in the same time as 3km against the
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The speed of a boat in still water is 15km/hr and the rate of current is
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A man can row 5kmph in still water. If the river is running at 1kmph,
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If a man rows at the rate of 5kmph in still water and his rate against
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There is road besides a river. Two friends started from a place A, moved to a temple
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A boat moves downstream at the rate of one km in 5 minutes and upstream at the rate of 4 km an hour. What is the velocity of the current?

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