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X is 3 times as fast as Y and is able to complete the work in 40 days less than Y. Then the time in which they can...
Solution
Let us assume that Y can complete the work in ‘a’ days
⇒ X can complete the work in ‘a − 40’ days
Given X is 3 times as fast as Y
⇒ Y takes 3 times the time taken by X to complete the task
⇒ a =...
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