if a man rows at 6 kmph in still water and 4..., Problems On Boats & Streams, General Mathematics

Question:If a man rows at `6` kmph in still water and `4.5`kmph against the current then his rate along the current is :

A `9.5 km/hr` 
B `7.5 km/hr` 
C `7 km/hr` 
D `5.25 km/hr`

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+ AnswerB

+ ExplanationLet the rate of the stream be x kmph 

Then, rate against the current 

`= (6 - x) kmph`

`:. 6 - x = 4.5`

`or x = 1.5`

:. Rate of current 

`= 1.5 kmph`

Rate along the current 

`= (6 + 1.5) kmph = 7.5 kmph`

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