SOLUTION: At 1:30 pm, two planes leave Chicago, one flying east at 540 km/hour and the other flying west at 620 km/hour. At what time will they be 1450 km apart?

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Question 473160: At 1:30 pm, two planes leave Chicago, one flying east at 540 km/hour and the other flying west at 620 km/hour. At what time will they be 1450 km apart?
Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!
 

Hi,

Let x represent the time it will take them(in hours) to be 1450 km apart

Question states*** Note:  D = r*t

  540kmph*x + 620kmph*x = 1450km

                      x = 1450km/1160

                      x = 1.25hrs or 1hr 15min

they will be 1450 km apart at 2:45 pm