An airplane left miami, fl. at the same time another plane left santiago, chile. the two planes flew toward each other at rates of 625 mph and 575 mph. if miami and santiago are 4200 miles apart, how long will it take until the planes pass each other?

Since we know that LCM of both 625&575 is 14375, we must find the hours it took for both planes to arrive at this same destination.

Plane 1(625): Took 23 hours to arrive.

Plane 2(575): Took 25 hours to arrive.

Therefore, the answer should be from 23-25 hours to arrive or if looking for middle number, 24 hours exactly.

Hope this helps.

First subtract 10 from both side
y^2+6y-16=0
(y+8)(y-2)=0
-8 and 2