Question

A task can be completed in pairs among three persons P, Q, R as follows: P and Q take 60 days; Q and R take 120 days; P and R take 90 days. In how many days can the task be completed if P, Q, and R work together?

Answer 1

task compete by

= P & Q - 60 days

= Q & R - 120 days

= P and R - 90 days

Then we add 120+60+90

= 270

Then we divide 270 by 3

= 270/3

= 90 days

ans. They all take 90 days to complete the task .....