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Two airplanes leave Chicago at the same time and fly in opposite directions. If one travels at 350 miles per hour and the other at 400 miles per hour, how long will it take them to be 1125 miles apart?

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rlbnll562
                    rate                          time                        distance
plane 1        350                          t             

plane 2        400                          t

350t+400t=1125
750t=1125
t=1.5

they'll be 1125mi apart in 1.5 miles

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