Question

a can complete a work in 'p' days. B alone can do the same work in 'q' days If A and B together complete the work in 'r' days. What is the relation between p,q and r?

PLEASE ANSWER MY QUESTION AND I WILL MARK YOU AS BRAINLY ​

Answer 1

Step-by-step explanation:

a's 1 day's work=1/p

b's 1 day's work=1/q

and (a+b)'s work= r

so, (a+b)'s 1 day's work =1/r

therefore relationship between p,q and r

1/p+1/q=1/r

or r= pq/p+q