The river

The river flows at 4 km/h. A boat can go downstream thrice as fast as upstream. Find the speed of the boat in still water.

Correct answer:

v =  8 km/h

Step-by-step explanation:

v0=4 km/h v1 = v+v0 v2 = vv0  v1=3v2  v+v0=3 (vv0) v+4=3 (v4)  2v=16  v=216=8=8 km/h  v=8   Verifying Solution:  v1=v+v0=8+4=12 km/h v2=vv0=84=4 km/h



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