Distance between ships At 1:00 p.m.ship A is 30 miles due south of ship B and is sailing n...

Distance between ships At 1:00 p.m.ship A is 30 miles due south of ship B and is sailing north at a rate of 15 mi/hr. If ship B is sailing west at a rate of 10 mi/hr, find the time at which the distance d between the ships is minimal (see the figure).

EXERCISE