Question

a sailor goes 8km downstream in 40minutes and return in 1hour determine the speed of speed of the sailor In still water and the speed of the current

Answer 1

Let speed of stream = y kmph & speed of boat = x kmph
speed downstram((x + y)kmph) = 8 * 60 / 40 kmph
= 12 kmph
speed upstream((x - y) kmph) = 8/1 kmph
= 8 kmph
x + y = 12
x - y = 8
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2x = 20,
2y = 4
x = 10,
y = 2
=>Speed of stream = 2 kmph, Speed of boat = 10 kmph

Answer 2

Answer:

⇒ x + y = 12  

⇒ x - y = 8  

--------------  

⇒ 2x = 20,  

⇒ 2y = 4  

⇒ x = 10,  

⇒ y = 2  

⇒Speed of stream = 2 kmph, Speed of boat = 10 kmph