Math Help =(

Could someone please help me with this problem? It's not like I'm being lazy hoặc anything, I really need help! I can't get it, and it's pissing me off >=(

Two planes started from the same time at the same airport and flew in opposite directions. One of the planes flew 70 mph faster than the other. in 5 hours, the planes were 3850 miles apart. Find the rate of each plane.

I'm normally good at các câu hỏi like this, but I can't seem to figure this one out. Any help would be greatly appreciated!!!!!!!!!