Question

You are on the south side of a river that is 100m wide and following at 2m/s towards the east. Your boat can travel at 5m/s relative to the water. You want to land your boat on the north shore of the river at a point that is 40m [w] of your original position. Draw and label a diagram of the situation

Answer 1

$t=\sqrt{t_1t_2}=\sqrt{\frac{s_1s_2}{v_1v_2}}=20~s.$