d = \frac{1680}{7} = 240

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• \frac{4d}{240} + \frac{3d}{240} = 7 \\
• \frac{7d}{240} = 7 \\
• 7d = 1680 \\
• The distance between City A and City B is 240 km.
• #### 240 km
• A rectangle's length is twice its width. If the perimeter is 48 cm, what are the rectangle's dimensions?

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