Question

An assignment is done by three people p, q and r. P alone takes 20 hours to complete a single project but q and r working together takes 8 hours, for the completion of the same project. Ifall of them worked together and completed 28 assignments, then how many hours have they worked?

Answer 1

Answer:

Solution:

1A=10 and 1B+1C=14 (Given)

1A+1B+1C=14+110=720

In 20 hours, working together they will complete 7 products. 

Thus in 40 hours they will complete 14 products

Hope it's helpful for you mate