Two people start driving toward each other starting from two

Two people start driving toward each other, starting from two towns 100 miles apart. If one person travels 30 miles per hour and the other person travels 20 miles per hour, how long will it take until they meet?

Solution

D=RT
100=(30+20)T
100=50T
T=100/50
T=2 HOURS THEY WILL MEET.