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Aptitude - Boats and Streams - Discussion

@ : Home > Aptitude > Boats and Streams > General Questions - Discussion

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"Nothing in life is to be feared, it is only to be understood."
- Marie Curie
6. 

A boat running downstream covers a distance of 16 km in 2 hours while for covering the same distance upstream, it takes 4 hours. What is the speed of the boat in still water?

[A]. 4 km/hr[B]. 6 km/hr
[C]. 8 km/hr[D]. Data inadequate

Answer: Option C

Explanation:

Rate downstream = 16 kmph = 8 kmph.
2

Rate upstream = 16 kmph = 4 kmph.
4

Speed in still water = 1 (8 + 4) kmph = 6 kmph.
2

Shahed Ahmed said: (Wed, Aug 24, 2011 01:25:02 PM)    
 
Why we multiply 1/2 (8+4) ?
Shashi said: (Wed, Aug 31, 2011 05:34:31 PM)    
 
Why we are adding both and multiply by 1/2(8+4) ?
Mrithula said: (Wed, Dec 14, 2011 12:50:24 PM)    
 
Formula for finding the speed of the boat is
1/2(upstream speed+ downstream speed)
here upstream speed=8 and
downstream speed=4
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