d=r*t

d=47t north

d=54(t-1) south

552=47t+54(t-1)

552=47t+54t-54

552+54=101t

606=101t

t=606/101

t=6 hours after the truck leaves

check: 6*47=282, 5*54=270, 282+270=552 miles

Crystal P.

asked • 11/11/17A truck leaves St. Louis Missouri traveling north on I 55 at an average rate of 47 mph. One hour later a bus leaves St. Louis traveling south on I 55 at an average rate of 54 mph. How long after the truck leaves will it take until they are 552 miles apart?

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d=r*t

d=47t north

d=54(t-1) south

552=47t+54(t-1)

552=47t+54t-54

552+54=101t

606=101t

t=606/101

t=6 hours after the truck leaves

check: 6*47=282, 5*54=270, 282+270=552 miles

Carol H. answered • 11/11/17

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