Question 325599
speed of A = 30 m/hr
speed of B = 20 m/hr.
..
Let them meet at distance x miles from A
so B runs 500-x  
Time is the same.
..
Time = Distance / speed
x/30= (500-x) /20
20x=30(500-x)
20x=15000-30x
50x = 15000
x= 300. they will meet 300 miles from where A started.
speed of A = 30 mph
time = 300 / 30
= 10 hours.
They will meet after 10 hours