Aptitude - Boats and Streams - Discussion

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"Everything should be made as simple as possible, but not simpler."

- Albert Einstein

A man 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?

[A].	2.4 km	[B].	2.5 km
[C].	3 km	[D].	3.6 km

Answer: Option B

Explanation:

Speed downstream = (5 + 1) kmph = 6 kmph.

Speed upstream = (5 - 1) kmph = 4 kmph.

Let the required distance be x km.

Then, x + x = 1

6 4

2x + 3x = 12

5x = 12

x = 2.4 km.

Anil said: (Fri, Oct 8, 2010 12:51:18 AM)

2x+3x=12 Is that multiplication of 23. If yes, why we have to multiply 23 ?

Sasikumar said: (Fri, Dec 10, 2010 12:01:50 AM)

Speed downstream = (5 + 1) kmph = 6 kmph. Speed upstream = (5 - 1) kmph = 4 kmph. average speed=2(6)(4)/(6+4)

Bhima God said: (Thu, Apr 21, 2011 10:49:10 PM)

Mul of 6 and 4 should be 24 right?...how that 12 comes?

Dts said: (Fri, Jun 3, 2011 02:37:03 AM)

Here we take lcm only.

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Aptitude - Boats and Streams - Discussion

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