Two trains leave a city at the same time. one train goes west at a constant rate of 60 mph. the other goe 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

5 hours.

Step-by-step explanation:

Combined speed of the trains = 50 + 60 = 110 mph.  They are increasing the distance between them at 110 mph.

Therefore  the time when they are 550 miles apart  is distance / speed

= 550/110 = 5 hours.

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