Are you ready for a brain twister? Murphy can row at 5 kmph in still water. If the velocity of current is 1 kmph and it takes him 1 hour to row to a place and come back, how far is the place?
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this is not a question of social science
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We analyse the question as follows:
The speed when the boat is moving against the current is given as follows:
= Speed of the boat - speed of the current
= 5 - 1 = 4 km/h
The speed of the boat when the boat is moving downstream is as follows:
= Speed of the boat + Speed of the current.
= 5 + 1 = 6 km/h
Let the distance to the place be x.
Time = Distance/speed
= x/4 + x/6 = 1
Eliminate the denominators as follows:
6x + 4x = 4 × 6
10x = 24
x = 24/10
= 2.4 km
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