ExplanationSince the two women are working together, add their rates. To find their individual rates, divide work by time. Never divide time by work! (Also, be careful when dividing the work by \(\frac{1}{2}\).

The rate is the reciprocal of \(\frac{1}{2}\), or 2 tables per hour.)

Find Jenny and Laila’s combined rate, then divide the work required (1 table) by this rate: 1 table ÷ \(\frac{7}{3}\) table per hour = \(\frac{3}{7}\) hour.

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Hence option D is correct!
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Sandy

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