At noon, ship A is 150 km west of ship B. Ship A is sailing east at 35 km/h and ship B is sailing north at 30 km/h. How fast is the distance between the ships changing at 4:00 PM?

Answer 1

Been there, done that. 1st related question below:

http://www.jiskha.com/display.cgi?id=1425923355

Always check the related questions when you have posted one. Yes, it's not often easy to find the ones you want before.