Question

solve plzzzzzzx with simplification​

Answer 1

V = streamer speed

U = stream speed

For downstream,

U + V because in the direction of the stream

For upstream,

V - U because in the opposite direction of the stream

Distance between ports = d

Speed = distance /time

For downstream,

(V + 3km/hr) = d / 8

d = (V + 3km/hr) * 8

For upstream,

V - 3km/hr = d / 12

d = (V - 3km/hr) * 12

So

(V + 3km/hr) * 8 = (V - 3km/hr) * 12

4V = 60 km/hr

V = 15 km/hr

Have a great day