Question

X and Y can do a piece of work in 12 hours and 15 hours respectively if they work together how long will they take to complete the work​

Answer 1

Step-by-step explanation:

Time taken by x to finish work = 12hrs

Time taken by y to finish work = 15hrs

Work done by x in 1hr = 1/12

Work done by y in 1hr = 1/15

Work done by both (x+y) to finish work in 1 hr = 1/12+1/15 = 5+4/60

=9/60 =3/20

Time taken by (x+y) to finish work = 1/3/20 = 20/3

6×2/20

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