Question

a boat goes 6 km upstream and 57 km downstream in 5 hours. in 9 hours it can go 21 km upstream . determine the speed of stream and that of boat in still water

Answer 1

Answer:

in 9 hours it can go 21 km upstream can you plz give me the complete question that what is the distance of downstream in 9 hours

Step-by-step explanation:

let speed of boat be x

let speed of current be y

therefore,

speed downstream = x+y

speed upstream= x-y

given that,

a boat goes 6 km upstream and 57 km downstream in 5 hours

so,

time taken to go 6 km upstream + time taken to go 57 km downstream = 10         hours

we know that s=d/t

therefore, 6/x-y  +  57/x+y   = 10                 -----------1

similarly,