A motorboat going downstream overcame a raft at a point A,t=60min later it turned back and passed the raft at a distance L=6.0km from the point A .Find the flow velocity assuming the duty of the engine to be constant.
-
UP 0 DOWN 0 0 1
1 Answers
1
displacement of boatman = displacement of raft
A1 - A2 = A3
(vbr+vr)(1) - ( vbr - vr )(t) = (vr)(t+1)
which gives t = 1 hr
now . displacement of raft i.e,A3 is 6km
hence ,
(t+1)vr = 6 → 2vr = 6 → vr = 3 km/hr
