A boat travels from south bank to north bank of a river with a maximum speed of `8km//h`. A river current flows from west to east with a speed of `4km//h`. To arrive at a point opposite to the point of start, the boat should start at an angle:

Options

A. `tan^(-1)(1//2)` W of N
B. `tan^(-1)(1//2)` N of W
C. `30^(@` W of N
D. `30^(@` N of W

Answer

C