A Submarine Passes $30 \mathrm{~m}$ Beneath a Boat While Traveling At $8.89 \mathrm{~m} / \mathrm{s}$

Short Answer

A submarine passes $30 \mathrm{~m}$ beneath a boat while traveling at $8.89 \mathrm{~m} / \mathrm{s}$ on a course of $\mathrm{N} 34^{\circ} 21^{\prime} \mathrm{W}$ . The boat continues on a heading of $\mathrm{N} 55^{\circ} 39^{\prime} \mathrm{E}$ at a speed of $13.3 \mathrm{~m} / \mathrm{s}$ .
(a) How far do radio signals between the two craft have to travel 3 s later?
(b) How fast are the two craft moving apart at this time?