A swimmer A who want to reach directly at point B on the other bank of the river swims with minimum possible speed with respect to river and reaches directly at point B if width of river is w and river flows with velocity V then time in which swimmer crosses the river is

13. A swimmer A who want to reach directly at point B on the other bank of the river swims with minimum possible speed with respect to river and reaches directly at point B. If width of the river is w and river flows with velocity v ₀, then time in which swimmer crosses the river, is


$$\begin{gathered} \left(1\right) \frac{25w}{16v_0} \\ \left(2\right) \frac{25w}{12v_0} \\ \left(3\right) \frac{16w}{25v_0} \\ \left(4\right) \frac{12w}{25v_0} \end{gathered}$$