Question

please answer this question of quadratic equations

Answer 1

Let speed of stream = x
Speed in downstream = (5+x) km/h
speed in upstream = (5-x) km/h

Time req. to cover 40km in downstream = 40/5+x
time required to cover 40 km upstream = 40 / 5-x

ATP.

40/5-x = 3* (40/5+x)
or, 1/5-x = 3/(5+x)
or 5+x = 3 (5-x)
or 5+x = 15 - 3x
or, 4x = 10
or, x = 10/4 = 5/2 = 2.5

Therefore, speed of stream is 2.5 km/h

P.s. correct me I'm wrong.