A swimmer crosses a river of width d flowing at velocity v. While swimming, he keeps himself always at an angle of `120^(@)` with the river flow and on reaching the other end. He finds a drift of d/2 in the direction of flow of river. The speed of the swimmer with respect to the river is :

Options

A. `(2-sqrt(3))v`
B. `2(2-sqrt(3))v`
C. `4(2-sqrt(3))v`
D. `(2+sqrt(3))v`

Explanation

To solve the problem, we will break it down into steps.

### Step 1: Understand the scenario
We have a swimmer crossing a river of width \( d \) while the river flows with a velocity \( v \). The swimmer swims at an angle of \( 120^\circ \) with respect to the flow of the river. The drift experienced by the swimmer is \( \frac{d}{2} \).

### Step 2: Draw a diagram
Draw a diagram showing:
- The river flowing horizontally with velocity \( v \).
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