If Susan can finish a task in 10 hours and Tom can do it in 16 hours, how long will it take Tom to finish the task alone after they both work together for 4 hours, at which point Susan leaves?

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Correct answer marked below

5 hours

6 hours

5 hours and 36 minutes

Correct

6 hours and 20 minutes

6 hours and 30 minutes

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Explanation

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Official Explanation

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Let's assume the task requires 160 units of work. Susan completes 16 units of work per hour, while Tom completes 10 units per hour. Together, they accomplish 16 + 10 = 26 units of work per hour. In 4 hours, they will finish 4 * 26 =…

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Comments

PrakharNov 3, 2024

good question

What this question tests

What it tests

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

Common trap

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