Two trains leave a city at the same time. One train goes west at a constant rate of 60 mph. The other goes east at a rate of 50 mph. How long will it take the trains to be 550 miles apart? A. 5 hours
B. 7 hours
C. 9 hours
D. 11 hours

Lets t be the time that needed for trains to be 550 mi apart.

1st train will go (60*t) mi

2nd train will go (50 *t) mi

Altogether
(60t +50t), at the same time this distance equals 550 mi.

So, we can write

60t +50t =550
110t = 550
t=550/110
t=5 h

We have now proven that it would take 5 hours for the two trains to be 550 mile apart.
Hope this would help you.!!:)

I’m not sure about that