How to calculate when two objects,traveling at different speeds,in another location,and in another direction will reach the same distance?

So let's say bob and his friend Jenny are driving.Bob has a head start of 35 miles traveling west at 55 mph.Jenny,on the other hand,only has a head start of 10 miles while driving south at 65 mph.When will they reach the same distance?How do I set up an equation for solving this problem?Please answer ASAP so I could keep studying for a test tomorrow.thanks in advance!!