SOLUTION: two planes leaves the dallas- fort worth airport at the same time. one travels east at 550 mphs, and the other travels west at 500 mph. Assuming no wind, how long will it take for

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Question 712445: two planes leaves the dallas- fort worth airport at the same time. one travels east at 550 mphs, and the other travels west at 500 mph. Assuming no wind, how long will it take for the planes to be 2100 mi apart?
Answer by algebrahouse.com(1659) About Me  (Show Source):
You can put this solution on YOUR website!
distance = rate x time

one plane
rate = 550
time = t
distance = 550t

other plane
rate = 500
time = t
distance = 500t

When will their combined distances equal 2100

550t + 500t = 2100 {added distances and set equal to 2100}
1050t = 2100 {combined like terms}
t = 2 {divided each side by 1050}

In 2 hours they will be 2100 mi. apart

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