Question

boat travel 40 km upstream in river in same period of time as it take to travel 50 kilometre downstream if the rate of steam b 5 kilometre per hour find the speed of the boat in still water
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Answer 1

Step-by-step explanation:

let the speed of boat be (x-5) in upstream and (x+5) in downstream

s=d/t ,t= d/s

30/5= 6hours

50/5= 10hours

then the equation will be

6(x+5)=10(x-5)

6x+30=10x-50

+30+50=10x-6x

80=4x

x=80/4

=20

answer is 20kmph