Question

A can do a piece of work in 10 days and B can do it 15 days if both of them are working together, how many days will be required to complete half the work
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Answer 1

Answer:

3days

Step-by-step explanation:

A can do a peice of work in 10days

B can do a peice of work in 15 days

total work = LCM OF 10 AND 15

total work = 30

efficiency of A is 30÷ 10= 3

efficiency of B is 30÷15 = 2

total efficiency of both = 3 + 2 = 5

half of the work = 30÷2

15

therefore,

days required to complete half of the work if they work together = work ÷ total efficiency

= 15÷ 5 = 3 days