SOLUTION: the destination of your trip is 456 miles away. how much time will you need to make the trip if you drive 75 miles per hour and take 4 rest stops that average 21 minutes each?

Question 749542:
the destination of your trip is 456 miles away. how much time will you need to make the trip if you drive 75 miles per hour and take 4 rest stops that average 21 minutes each? round to the nearest tenth place.

Found 2 solutions by timvanswearingen, checkley79:
Answer by timvanswearingen(106) (Show Source): You can put this solution on YOUR website!

So it will take 6.08 hours for just the driving time alone.
Multiply 6.08 * 60 to find the number of minutes.

364.8 minutes of driving time. Now we need to calculate the stopped time and add to the driving time:

So there are 84 minutes of stopped time.

It takes 444.8 minutes. Let's divide this by 60 to find the number of hours.

So it takes approximately 7.4 hours

Answer by checkley79(3341) (Show Source): You can put this solution on YOUR website!
d=rt
456=75(t-4*7/20)
456=75(t-28/20)
456=75(t-1.40
456=75t-105
75t=456+105
75t=561
t=561/75
t=7.5 hours.
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