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?

PhysicsHardHigh School (11–12)Mechanics › Relative Motion

The same boat ( $2.5\ \text{m/s}$ in still water, river $150\ \text{m}$ wide flowing at $1.5\ \text{m/s}$ ) is now aimed upstream so that it lands straight across. How long does the crossing take?

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