Question:A boat takes `4` hours for travelling downstream from point A to point B and coming back to point A upstream. If the velocity of the stream is `2` kmph and the speed of the speed of the boat in still water is `4` kmph, what is the distance between A and B ? 

A `4 kms` 
B `6 km` 
C `8 km` 
D `9 km` 

+ Answer
B 

+ Explanation
Let the distance between A and B x hm.

Speed downstream`= 6` kmph, speed upstream`= 2 kmph` 

`:.x/6 + x/2 = 4 ⇔ 4x = 24 ⇔ x = 6`

:. Distance AB`= 6 km.`

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Irin Moni

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