Question

A motor boat goes downstream and covers a distance in 4 hours while it covers the same distance upstream in 5 hours.if the speed of the stream is 3 km/hr,find the speed of the motor boat in still water​

Answer 1

Answer:

the speed of motorboat is 27km/hr

Answer 2

Step-by-step explanation:

Let the speed of the motorboat be X.

speed of motorboat in downstream=x+3

speed of motorboat in downstream=x-3

since,distance=time x speed

therefore,

distance travelled by speed of X+3=4(X+3)

distance travelled by speed of x+-3=5(x-3)

since distance travelled was same, so

4(X+3)=5(x-3)

4x+12=5x-15

4x-5x=-15-12

-x=-27

X=27

therefore, the speed of motorboat is 27 km/hr