Originally Posted by

**Arturo_026** Any hints on how to set up the function for this problem?

**A boat leaves a dock at 2:00 pm and travels due south at a speed of 20 km/hr. Another boat has been heading due east at 15 km/hr and reaches the same dock at 3:00 pm. At what time were the two boats closest together?**

From the question, I know that I have to minimize the distance between the boats, which can be obtained using the pythagorean theorem or distance formula. But that's about all I can think of.

Anyone have any idea on how to set the equation using those speeds?

Thanks in advance.