For a car moving at a constant speed, the distance traveled varies directly with the time spent driving. If such a car travels 225 miles in 3 hours, how many miles does it travel in 7 hours?
\( \square \) miles
Answer
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Answer
\( \square \) miles
Steps
Step 1 ：\(d = k \cdot t\)
Step 2 ：\(225 = k \cdot 3\)
Step 3 ：\(k = \frac{225}{3} = 75\)
Step 4 ：\(d = 75 \cdot 7 = 525\)
Step 5 ：\( \square \) miles
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