Question

the speed of a stream is 3 km/hr .A boat travels a distance of 91 km in downstream and the same distance in upstream and the total time to cover this distance is 20 hours what is the speed of boat

Answer 1

let the speed of boat be x and speed of stream be y.

speed in downstream is X + Y while speed in upstream is x minus y. y is 3 km per hour.

that means
X + 3 km per hour + X - 3 km per hour = 91 km per 20 hours

2x = 9.1 km per hour.
X = 9.1 upon 2
X = 4. 55 km per hour.