Question

A streamer goes downstream and covers the distance between two ports in 3 hours.It covers the same distance in 5 h ,when it goes up stream .If the stream flows at 3km/h,then what is the speed of streamer uostream

Answer 1

speed of streemer upstream

x-y=12-3=9 kmph

Explanation:

let the distance between the ports is

x km

distance covered by downstream

x+y=D/3

x+3=D/3....(1)

lly

upstream

x-y=D/5

x-3=D/5.....(2)

(1) -(2)

6=D/3-D/5

6=5D-3D/15

6=2D/15

D=45 km

substitute D Value in 1

x+3=45/3

x+3=15

x=12 (speed of streamer)