X is 3 times as fast as Y and is able to complete the work in 40 days – McqOptions

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1.	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 complete the work together is :
A.	15 days
B.	10 days
C.	7 1/2 days
D.	5 days
Answer» B. 10 days

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