SOLUTION: Dan drives 300 miles to attend college on the drive back home his average speed decreases by 10 miles per hour.. write an equation that gives the total driving time t ( in hou

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Question 356844: Dan drives 300 miles to attend college on the drive back home his average speed decreases by 10 miles per hour..

write an equation that gives the total driving time t ( in hours ) as a function of average speed r ( in miles per hour ) when driving to college ..

then it says
find the total driving time if he drives to college at an average speed of 60 miles per hour..

Answer by ewatrrr(24785)   (Show Source): You can put this solution on YOUR website!


Hi,

distance = rate*time or time = distance/rate

*Let T be the total driving time to and from college

T= 300/r + 300/(r-10)

.

traveling to college at an average speed of 60 miles per hour.. 

T = 300/60 + 300/50

T = 5 + 6

T = 11 hrs 

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