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Answer: t=6 hours

Step-by-step explanation:

For this problem, we are given the values for r and d. We can directly plug those values in and solve for t.

450=75t             [divide both sides by 75]

t=6 hours

Now, we know that there are t=6 hours.

Answer:

450=75T

Divide both sides by the 75

T=6h