A motorboat goes downstream in a river and covers the distance between two ports in 5 hours and returns back in 7 hours. If the water is flowing at 2 km/hour,find the speed of the boat in still water.
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Answered by
55
Let the speed of boat in still water be x
Speed of current = 2 km/h
Speed in down stream = x+2km/h
Time=5hrs
Speed in upstream =x-2km/h
Time =7hrs
Here ,the between two portsmis equal
So, d =s/t
Atq,
5(x+2)=7(x-2)
= 5x+10=7x-14
=10+14 = 7x-5x
=24=2x
=x=24/2
=x=12
Therefore,speed of boat in still water = 12km/h
I hope this ans will help u.......
Answered by
3
Answer:
D=S/T
5(x+2)=7(x-2)
= 5x+10=7x-14
=10+14 = 7x-5x
=24=2x
=x=24/2
=x=12
Therefore,speed of boat in still water = 12km/h
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