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Vikas can complete a job in 15 days. Bablu can do the same job in 10 days. In how many days can they complete the job if they work together?
Question

Vikas can complete a job in 15 days. Bablu can do the same job in 10 days. In how many days can they complete the job if they work together?

A.

5 days

B.

6 Days

C.

8 Days

D.

9 Days

Correct option is B

Given:

Vikas complete the work = 15 days

Bablu can complete the same work = 10 days

Solution:

Total work = LCM of (15, 10) = 30 units

Efficiency  of Vikas  = 30/15  = 2 unit/day 

Efficiency of Bablu = 30/10 = 3 unit/day

Both efficiency = 2 + 3 = 5 unit/day

Together they complete the work = 30/5 = 6 days.


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