18)
Swimmers speed along the river (downstream) is 20km/hr

and can swim Cupstream) at 8km lhr. calculate the
velocity of the stream and the swimmer's possible
speed in still water,

When swimming downstream, the velocity (speed, really) of the stream (Vs) and the speed of the swimmers (Vm) are collaborative. When swimming upstream the speed of the stream subtracts to the speed of the swimmers, thus:

Vm + Vs = 20

Vm - Vs = 8

Adding both equations:

2Vm = 28

Vm = 28/2 = 14

From the first equation:

Vs = 20 - Vm = 20 - 14 = 6

The speed of the stream is 6 km/h and the speed of the swimmers in still water is 14 Km/h

18)Swimmers speed along the river (downstream) is 20km/hrand can swim Cupstream) at 8km lhr. calculate thevelocity of the stream and the swimmer's possiblespeed in still water,​

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18)
Swimmers speed along the river (downstream) is 20km/hr

and can swim Cupstream) at 8km lhr. calculate the
velocity of the stream and the swimmer's possible
speed in still water,