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?

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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) About Me  (Show Source):
You can put this solution on YOUR website!
456%2F75
6.08
So it will take 6.08 hours for just the driving time alone.
Multiply 6.08 * 60 to find the number of minutes.
6.08%2A60
364.8
364.8 minutes of driving time. Now we need to calculate the stopped time and add to the driving time:
4%2A21
84
So there are 84 minutes of stopped time.
364.8%2B80
444.8
It takes 444.8 minutes. Let's divide this by 60 to find the number of hours.
444.8%2F60
7.413333333333
So it takes approximately 7.4 hours

Answer by checkley79(3341) About Me  (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.