7d = 1680 \\

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• Finding a common denominator (240):
• \frac{4d}{240} + \frac{3d}{240} = 7 \\
• \frac{7d}{240} = 7 \\
• d = \frac{1680}{7} = 240
• The distance between City A and City B is 240 km.
• #### 240 km

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