SOLUTION: I need help setting up this problem: At 10:30 am 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 a

Question 775159: I need help setting up this problem:
At 10:30 am 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?
I tried making a table, but i don't know where to start at all.
thanks so much
Answer by reviewermath(1029) (Show Source): You can put this solution on YOUR website!
Q:
At 10:30 am 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?
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A:
Let x be the number of hours after 10:30 am (time)
Equation: 560x + 640x = 2100
1200x = 2100
x = 2100/1200
x = 1.75 hours
1.75 hours = 1 hour and 45 minutes
10:30 am + 1 hour + 45 minutes = 12:15 pm
Answer: 12:15 pm
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