Question

A motorboat goes downstream and covers a distance in 4 hours while it cover the same distance upstream in the 5 hours at the speed of the stream in is 3 kilometre per hour find the speed of the motor boat in still water​

Answer 1

Answer:

27kmph

Step-by-step explanation:

given: s=stream speed =3kmph

t1=4hr, t2=5hr

let v be the speed of boat

wkt, distance covered is same, so

t1(v+s)=t2(v-s)

4(v+3)=5(v-3)

4v+12=5v-15

v=27kmph