Question:A man rows to a place `48` km distance and back in `14` hours. He finds that he can row `4` km with the stream in the same time as `3` km against the stream. The rate of the stream is : 

A `1 km∕hr` 
B `1.8 km∕hr` 
C `3.5 km∕hr` 
D `1.5 km∕hr` 

+ Answer
A 

+ Explanation
Suppose he moves `4` km downstream in xj hours, Then, speed downstream 

`= (4/x) km∕hr,`

speed downstream 

`= 6 km∕hr.`

Rate of the stream

`= 1/2 (8 - 6) km∕hr`

`= 1 km∕hr.`

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Irin Moni

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