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Q

A man can row 4.5 km/hr in still water and he finds that it takes him twice as long to row up as to

 

A man can row 4.5 km/hr in still water and he finds that it takes him twice as long to row up as to row down the river. Find the rate of stream.

 

  • Option 1)

     

    6 kmph

     

  • Option 2)

     

    1.5 kmph

     

  • Option 3)

     

    2.5kmph

     

  • Option 4)

     

    4.5 kmph

     

  • Option 5)

     

    3.5 kmph

     

Answers (1)
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Let's assume stream speed = x

Man's Speed = 4.5

Upstream Speed = 4.5 - x 

Download Speed = 4.5 + x

Downstream Time : Upstream Time = 1 : 2

Downstream Speed : Upstream Speed = 2 : 1

(4.5 - x)/(4.5 + x) = 1/2

9 - 2x = 4.5 + x

3x = 4.5 => x = 1.5

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