Question

p q and R can finish a task in 8 10 and 12 hours respectively they started working to get together after 3 hours p and r are left how long q
will take you to finish the task now

Answer 1

(A)'s 1 hour work= 1/8
(B)'s ". ". ". =1/10
(C)'s = 1/12
(A+B+C)'s work together= 1/8+1/10+1/12
= 12+10+15/120
=37/120
They work together till 3 hrs
= 37/120*3
= 37/40
(C)'s left = 1-37/40
= 40-37/40
=3/40
=40/3 = 13 1/3