Please help and explain
A man is walking 3 miles per hour toward point B

from point A. At the same time, a woman is

running 6 miles per hour toward point A from

point B. If point A and point B are 15 miles apart,

how far from point B will they meet?

E. 5 miles

F. 6 miles

G. 9 miles

H. 10 miles
PLEASE PLEASE HELP I NEED THIS ANSWER