A boat heading due north crosses a wide river with a speed of 10.0 km/h relative to the water. The water in the river has a uniform speed of 5.00 km/h due east relative to the Earth. Determine the velocity of the boat relative to an observer standing on either bank.

Question

$\begin{array}{1 1}11.2 km/h, 26.6^{\large\circ}\\12.2 km/h, 36.6^{\large\circ}\\13.2 km/h, 25.6^{\large\circ}\\10.2 km/h, 16.6^{\large\circ}\end{array}$