Question

A boat travels upstream in a river in the same petiod of time as it takes to travel 30 km dowmn stream . if the rate of the stream is 4 km/ hr, find the speed of boat in still water

Answer 1

hey
mate
here
is

your answer
.
.

km is wrong

Answer 2

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