SOLUTION: I need help with solving a word problem that always stumps me when i try to complete it. Here it is: At 10:30 am two planes leave Houston, one flying east at 560 km/h and the ot

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Question 495388: I need help with solving a word problem that always stumps me when i try to complete it. Here it is:
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 have tried using a chart
Rate x Time = Distance
Plane 1: 640 x

Plane 2: 560 x???
640x+ 560x= 2100


Found 2 solutions by Edwin McCravy, stanbon:
Answer by Edwin McCravy(20054) About Me  (Show Source):
You can put this solution on YOUR website!
That's exactly right.  You just need to finish

640x + 560x = 2100
      1200x = 2100
          x = 2100%2F1200
          x = 7%2F4
          x = 1%263%2F4

That's 1 hour and 45 minutes.
   
I hour and 45 minutes from 10:30 am is 12:15 pm.

Edwin

Answer by stanbon(75887) About Me  (Show Source):
You can put this solution on YOUR website!
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 have tried using a chart
Rate x Time = Distance
Plane 1: 640 x
Plane 2: 560 x
640x+ 560x= 2100
---
1200x = 2100
x = 21/12
x = 7/4 hrs = 1.75 hr = 1 hr 45 minutes
-----
Time: 10:30 + 1 hr 45 = 12:15 pm
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Cheers,
Stan H.
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