SOLUTION: The Griswalds averaged 45 mph on their way to Las Vegas and 60 mph on the way back home using the same route. What is the distance from their home to Las Vegas if the total drivi
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-> SOLUTION: The Griswalds averaged 45 mph on their way to Las Vegas and 60 mph on the way back home using the same route. What is the distance from their home to Las Vegas if the total drivi
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Question 335548: The Griswalds averaged 45 mph on their way to Las Vegas and 60 mph on the way back home using the same route. What is the distance from their home to Las Vegas if the total driving time was 70 hours. Found 2 solutions by Fombitz, nyc_function:Answer by Fombitz(32388) (Show Source):
You can put this solution on YOUR website! Rate*Time=Distance
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1.
2.
3.
From eq.1,
From eq. 2,
Substitute into eq. 3,
Multiply both sides by miles
You can put this solution on YOUR website! D = rt
They were both the same distance, so:
rt = rt
45t = 60(70 - t)
45t = 4200 - 60t
105t = 4200
t = 40h
45 mi/h for 40h
60 mi/h for 30h
45 * 40 = 1800 mi
