SOLUTION: Two planes start at the same time from points that are 1550 kilometers apart. How long will it take the two planes to meet if plane A flies at 220 kilometers an hour and plane B fl

Question 717471: Two planes start at the same time from points that are 1550 kilometers apart. How long will it take the two planes to meet if plane A flies at 220 kilometers an hour and plane B flies at 280 kilometers an hour?
Answer by jndarrell(58) (Show Source): You can put this solution on YOUR website!
Create your D=RT box chart and fill in appropriately with the following data derived from your problem:
Plane A
Rate: 220
Time: x
Plane B
Rate: 280
Time: x
Time is x b/c that is what we are looking for. Always remember, when a problem provides you with a total distance, whether it be distance between two objects or total distance they are to travel...a total is a total. You will take the sum of the two objects R*T and set them equal to the total distance. See below:
220x + 280x = 1550
500x = 1550
Divide both sides by 500 to get your x alone
x= 3.1 hours
To check, take your D=RT formula and plug it into the equation created
220(3.1) + 280(3.1) = 1550
682 + 868
=1550 CHECK CORRECT!!!
Don't forget the units (hours) when providing your solution.
:)

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