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Derivation of Velocity-Time Relation by Graphical Method

A river is ...

Question

A river is $20 m$ wide. River speed is $3 m / s$ . A boat starts with velocity perpendicular to river current. Velocity of boat is $5 m / s$ . Find the time taken by the boat to reach the opposite bank.

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Solution

Given : Velocity of boat, $V_{b} = 5 m / s$ and Velocity of river water $V_{w} = 3 m / s$ Width of river, $d = 20 m$
Time taken by the boat to reach the opposite bank $t = \frac{d}{V_{b}}$
$⟹$ $t = \frac{20}{5} = 4$ s

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Derivation of Velocity-Time Relation by Graphical Method

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