Question

X and Y can do a piece of work in 72 days. Y and Z can do it in 120 days. X and Z can do it in 90 days. How many days does it take if all the three can work together?​

Answer 1

x and y can do work=72 days

yand z can do work =120 days

z and x can do work=90 days

72+120+90

=282 days