Question

It takes Darnell twice as long as Julius to complete the same job. When the men work together, they can complete the job in 4 hours.
How many hours are required for Darnell to do the job alone?



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Answer 1

1 = 4/r + 4/2r

multiply each side by 2r

2r = 8 +4

2r = 12

r = 6

It takes Julius 6 hours to do the job

It takes Darnell 12 hours to do the job

Answer 2

It takes Darnell 12 hours to do the job, just took the test