A boat 3

A boat takes 1 hour longer to go 36 km up a river than to return. If the river flows at 3 km/h, find the rate at which the boat travels in still water.

Correct answer:

v =  15 km/h

Step-by-step explanation:

t2 = 1+t1 s=36 km v0=3 km/h  s=(v+v0) t1 = (vv0) t2 (v+v0) t1 = (vv0) (1+t1) = s  (v+v0) t1=s (vv0) (1+t1) = s  (vv0) (1+s/(v+v0)) = s  (vv0) (v+v0+s)/(v+v0) = s  (vv0) (v+v0+s) = s(v+v0) v2=225  v=225=15 km/h



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