Two ships are steaming towards each other. Ship A is travelling at 20 km h -1 and ship B is travelling at 15 km h -1 . When they are 1 km apart, ship B alters course by 30 ° . Determine the closest...

Two ships are steaming towards each other. Ship A is travelling at 20 km h
^-1
and ship B is travelling at 15 km h
^-1
. When they are 1 km apart, ship B alters course by 30 ° . Determine the closest distance between the ships as they pass each other and the time taken to reach this position.