Hi man,
Work problems --> ratios
One machine takes X hours to finishh the task and the other one takes 3/4*X to finish the same task. Together, they finish it in 6 hours so we can write:
1 / X + 1 /( (3/4)*X ) = 1/6
Solve this equation and you get X=14
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Source: Beat The GMAT — Problem Solving |
agreed.pepeprepa wrote:Hi man,
Work problems --> ratios
One machine takes X hours to finishh the task and the other one takes 3/4*X to finish the same task. Together, they finish it in 6 hours so we can write:
1 / X + 1 /( (3/4)*X ) = 1/6
Solve this equation and you get X=14
