# Calculus

posted by
**Anonymous**
.

A ship is sailing due north at 12km/h while another ship is observed 15km ahead, travellers due east at 9 km/h. What is the closest distance of approach of the two ships?

posted by
**Anonymous**
.

A ship is sailing due north at 12km/h while another ship is observed 15km ahead, travellers due east at 9 km/h. What is the closest distance of approach of the two ships?