Question

A boat takes 4 hrs to go 44km downstream and it can go 20 km upstream in the same time find the speed of the stream and that of the boat in still water

Answer 1

let  x =  speed  of  boat  and  y =  speed  of  stream

speed  downstream =  x + y  and  speed  upstream =  x -  y,  hence

x + y =  44/ 4 = 11  and  x - y =  20/4 = 5  ,  solving  we  get

x = 8   and  y = 3

Answer 2

Answer:

Step-by-step explanation:

Let speed of the boat =x km/hr

Speed of the stream =y km/hr

1st condition

Speed =distance /time

X+Y=44/4=11

X-Y=20/4=5

X+Y=11 _1st eqn

X-Y=5_2nd eqn

Then eqn 1st + eqn 2nd = 2x + 0Y=16

2X=16

X=16/2=8

Substituting X=8 in eqn 1 weget

8+Y=11

Y=11-8

Y=3

Therefore x=8 and y=3