A motor boat is to reach at a point $30^{\circ}$ upstream on the otherside of river flowing with velocity $5m/s$. Velocity of motor boat with respect to water is $5 \sqrt3 m/s$ .The driver should steer the boat at an angle

Question

$\begin{array}{1 1} a)30^{\circ} \text{ with respect to line of destination from starting point.} \\ b)120^{\circ} \text{ with respect to stream direction } \\ c)60 ^{\circ} \text{with respect to normal to back} \\ d)\text{None of these} \end{array}$