Person A can complete a job in 6 hours. Person B can complete the same job in 4 hours. Working at the same rate, how many hours will it take both of them to complete the job?

it will take both of them 2.4 hours to complete the job.

Step-by-step explanation:

Person A can complete a job in 6 hours. This means that the rate at which Person A can complete the job per hour is 1/6

Person B can complete the same job in 4 hours. This means that the rate at which Person A can complete the job per hour is 1/4

If they work together, they would work simultaneously and their individual rates are additive. This means that their combined working rate would be

1/6 + 1/4 = 5/12

Assuming it takes t hours for both of them to clean the room working together, the working rate per hour would be 1/t. Therefore,

5/12 = 1/t

t = 12/5

t = 2.4 hours

step-by-step explanation:

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