Question

........... ANSWER...........,

Answer 1

let speed of stream be xkm/hr

speed of boat upstream =8-x

speed of boat downstream=8+x

time taken to go 15 km upstrem=15/8-x

time taken to go 22km downstream= 22/8+x

given,

15/8-x + 22/8+x =5

after solving we get eq 5x^2-7x-24=0

5x^2-15x+8x-24=0

after solving we get x=3

speed of stream = 3 km/hr