If Sarah takes 20 minutes to consume a serving of potato wedges and Lisa takes 40 minutes for the same serving, how long will it take them to finish the serving if they alternate eating for one minute each, starting with Sarah?

Correct answer marked below

24.5 mins

26 mins

26.5 mins

Correct

28 mins

30 mins

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Assuming the total potato wedges in the serving is 40, Sarah eats 2 wedges per minute while Lisa eats 1 wedge per…

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What this question tests

Your ability to combine individual work rates, usually by working with the fraction of a job completed per unit of time.

Adding the times instead of the rates, or forgetting to take the reciprocal when combining rates.