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07.05.2020 •
Mathematics
Charlie is driving to Boston. Suppose that the distance to his destination (in miles) is a linear function of his total driving time (in minutes). Charlie has 49 miles to his destination after 15 minutes of driving, and he has 32.2 miles to his destination after 39 minutes of driving. How many miles will he have to his destination after 47 minutes of driving
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Ответ:
26.6 miles
Step-by-step explanation:
Given
Charlie distance to his destination is a linear function of total driving time
suppose distance d is related to time t as
at after
Substitute in (i)
at after
Solving (ii) and (iii) we get
substitute in eq (ii) we get
so after
So 26.6 miles is left to travel after 47 minutes
Ответ: