Question:A man can row a boat at `10` kmph in still water. If the speed of the stream is `6` kmph , the time taken to row a distance of `80` km down the stream is : 

A `8 hours` 
B `5 hours` 
C `10 hours` 
D `20 hours` 

+ Answer
B 

+ Explanation
Speed downstream 

`= (10 + 6) km/hr`

`= 16 km/hr`

Time taken to cover `80` km downstream 

`= (80/16) hrs`

`= 5 hrs`

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Irin Moni

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