A ferry points straight at the far bank of a 150 m wide river and keeps 2.5 m/s through the water. The river carries it along at 1.5 m/s. How far down the river from its start does it arrive?

PhysicsMediumHigh School (11–12)Mechanics › Relative Motion

A ferry points straight at the far bank of a $150\ \text{m}$ wide river and keeps $2.5\ \text{m/s}$ through the water. The river carries it along at $1.5\ \text{m/s}$ . How far down the river from its start does it arrive?

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← A boat moves at 6 m/s in still water on a river that flows at 2 m/s. It goes 160 m upstream and back. How long does the round trip take?The same boat (2.5 m/s in still water, river 150 m wide flowing at 1.5 m/s) is now aimed upstream so that it lands straight across. How long does the crossing take? →

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