Question

18. A boat covers a certain distance downstream in 2 hours. It covers the same distance upstrez
2 / hours. The speed of the boat in still water is 18 km/h. Find the speed of the wate
Also find the distance covered by the boat.
in
The answer there in the text book is 2km/h,40km​

Answer 1

we have 2 scenario upstream and downstream. if the boat is floating along the stream with same velocity, It is called as downstream(B+S). and if the boat is floating against the stream with same velocity is called upstream(B-S). here B and S are abbreviation of boat and stream respectively .In this case distance traveled by boat in the upstream and downstream are same.

Take we know stream(s) speed is 4kmph.

distance traveled in upstream = distance traveled in downstream

(B-S)time in upstream=(B+s) time in downstream

(B-4)2.5=(B+4)2

B=36kmph