Arthur D. answered • 04/15/15

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distance=rate*time

d=r*t

d=r*5

d=(r-83)*5

6005=r*5+(r-83)*5

6005=5r+5r-415

6005=10r-415

6005+415=10r

6420=10r

r=6420/10

r=642 mph for the faster jet

r-83=642-83=559 mph for the slower jet