SOLUTION: Brian drives 117 miles to the city. On the drive back home, his average speed decreases by 6 miles per hour.
Write two equations (for time, in hours) to the city and back home
Question 1003705: Brian drives 117 miles to the city. On the drive back home, his average speed decreases by 6 miles per hour.
Write two equations (for time, in hours) to the city and back home where "r" is the average speed (in miles per hour) when driving to the city.
Thank you so much! Found 2 solutions by josgarithmetic, stanbon:Answer by josgarithmetic(39623) (Show Source): You can put this solution on YOUR website! RT=D travel rates rule
TO CITY r () 117
RETURN r-6 () 117
Fill in the time cells.
TO CITY r 117/r 117
RETURN r-6 117/(r-6) 117
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website! Brian drives 117 miles to the city. On the drive back home, his average speed decreases by 6 miles per hour.
Write two equations (for time, in hours) to the city and back home where "r" is the average speed (in miles per hour) when driving to the city.
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To city DATA:
distance = 117 miles ; rate = r mph ; time = d/r = 117/r hrs
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From city DATA:
distance = 117 miles ; rate = r-6 mph ; time = 117/(r-6) hrs
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Equations:
Time to city = 117/r hrs
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Time from city = 117/(r-6) hrs
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Cheers,
Stan H.
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