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X works four times as fast as Y.Y takes 60 days more than X to complete a job. Find the time in which X and Y working together can complete the job ( in days)A. 20B. 10C. 16D. 12 |
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Answer» Correct Answer - C Let the time in which X and Y can complete the job be x days days y repectively. `(1)/(x)=4((1)/(y))" "(1)` `y=x+60 " "(2)` From Eq. (1), we get `y=4x` Substituting this value in Eq. (2) ,we get `4x=x=60` `x=20` `y=80` The time in which X and Y can complete the job (in days) `=(xy)/(x+y)=16` |
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