Tanishq crosses the river!

The velocity of water current varies as

{v=(125)y,                      y250mv=20(125)y,             y>250m\large \begin{cases} {v= (\frac{1}{25})y, ~~~~~~~~~~~~~~~~~~~~~~y \leq 250m} \\ {v= 20- (\frac{1}{25})y, ~~~~~~~~~~~~~y>250m} \end{cases}

where yy is the distance from one bank. The width of the river is 500m500m. If Tanishq is crossing the river with constant velocity 5m/s5m/s relative to water and perpendicular to the current, Find the drift of Tanishq in meters.

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