A truck driver averages 60 miles per hour while delivering freight and 45 miles per hour on the return trip. The total driving time is 7 hours. How long does each trip take?
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Answer:
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Given : A truck driver averages 60 miles per hour while delivering freight and 45 miles per hour on the return trip.
The total driving time is 7 hours.
To Find : How long does each trip take
Solution:
Distance = Speed * Time
Let Say distance each side = d miles
Time taken while going = d/60 hrs
Time taken while return = d/45 hrs
d/60 + d/45 = 7
=> 3d + 4d = 7 * 180
=> d = 180
Time taken while going = 180/60 = 3 hrs
Time taken while return = 180/45 = 4 hrs
Hence trips were 3 hrs and 4 hrs long.
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