A man can swim with a speed of `4kmh^(-1)` in still water. He crosses a river 1km wide that flows steadly at `3kmh^(-1)`. If he makes his strokes normal to the river current, how far down the river does he go when he reaches the other bank?

Explanation

To solve the problem, let's break it down step by step.

### Step 1: Understand the given data
- The width of the river (d) = 1 km
- Speed of the man in still water (v_m) = 4 km/h
- Speed of the river current (v_r) = 3 km/h

### Step 2: Calculate the time taken to cross the river
...