Question

❒ Question :–
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A boat can move downwards at a speed of 16 km/ hour and upstream at a speed of 9km /per hour what is the speed of the stream and the speed of the boat in still water ?
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Answer 1

Step-by-step explanation:

let the speed of boat in still water be X km per hour and the speed of steam be y km per hour

speed downstream = (X + y) km per hour

speed upstream = (x - y) km per hour

x+y = 16 ------ 1 eq.

x-y = 9 ------- 2 eq.

adding first and second equation

x + y + x - y = 16 + 9

2x = 25/2

x = 12.5

therefore y = 3.5

speed of boat in still water is 12.5 km per hour

speed of steam in still water is 3.5 km per hour

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