2 canoeists, A & B, live on opposite shores of a 300.0 m wide river that flows east at 0.80 m/s. A lives on the north shore and B lives on the south shore. They both set out to visit a mutual friend X who lives on the north shore at a point 200.0m upstream from A and 200.0m downstream from B. both canoeists can propel their canoes at 2.4 m/s thru the water. How much time must canoeist A wait after canoeist B sets out so that they both arrive at X at the same time? Both canoeists make their respective trips by the most direct routes.

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This is for a friend, so I don't have much work shown.

I know that B takes 125s.
CALC:
1. v=2.4-0.80=1.6m/s
2. t=200m/1.6m/s=125s

note: 2.4 is speed relative to the earth?

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