Question

P and Q can do one work in 40 days.P alone can do 1/ 5 of work in 10 days. in how many days Q alone can complete that work

Answer 1

P+Q=1/40
P=1/5×x=10
p=x/5=10
P=x=50 days
P=1/50
P+Q=1/40
1/50 +Q=1/40
Q=1/40 -1/50
Q=5-4/200
Q=1/200
Q completes in 200 days