SOLUTION: at 10:30 A.M. two planes leave Houston, one flying east at 560 km/h and the other flying west at 640 km/h. At what time will they be 2100 km apart?

Question 51627: at 10:30 A.M. two planes leave Houston, one flying east at 560 km/h and the other flying west at 640 km/h. At what time will they be 2100 km apart?
Answer by rchill(405) (Show Source): You can put this solution on YOUR website!
Because the planes are flying in opposite directions, the equation becomes where x is the value in hours. Combining like terms produces . Now divide both sides by 1200: which reduces to . This simplifies to or 1.75 hours, which is the same as 1 hour 45 minutes.
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