Question

A boat can go 30 km in upstream nd 44 km downstream in 10 hours..it can go 40 km upstream and 55km downstream in 13 hours.Find the speed of boat and that of stream.​

Answer 1

Step-by-step explanation:

let the speed of boat in still water be x and speed of stream be y

case 1-44/x-y+30/x+y=10

case 2-40/x+y+55/x-y=13

case 1-44x+44y+30x-30y/x^2-y^2=10

74x+14y/x^2-y^2=10

case 2-40x-40y+55x+55y/x^2-y^2=13

95x+15y/x^2-y^2=13

minus case 1 n 2