<PRE><B>Question 578745</B>

Essentially, train A has a 30 minute (1/2 hour) headstart, at 40 mph, that is 20 miles head-start

We want to solve for when the distance they travel is equal:

t is zero starting when train B passes the station:

D(a) = 40t+20
D(b) = 44t

40t+20 = 44t
4t = 20
t= 5 hours

5 hours from 4:50 PM, so 9:50 PM </PRE>