Question 288395
train a is going 40 mph for 30 minutes
so it goes 20 miles
train b is going 4 mph faster
so it will take 20/4=5 hours to catch up.
so at 10:45 pm train b will catch up to a
another way to do it

40*(t+1/2)=44t
40t+20=44t
20=4t
5=t
10:45 pm