Question

A complete work in 20 days be completed in 60 days he completes in 45 days all three persons working together

Answer 1

Answer

A = 20 days

B = 60 days

C = 45 days

One days work of:

A = 1/20

B = 1/60

C = 1/45

All together:

1/ 20 + 1/60 + 1/45 = 9 + 3 + 4/180

= 16/180

Number of days = 180/16

= 11.25 days

Answer 2

Solution :-

A complete work in 20 days

A's one day work = 1/20

B complete it in 60 days.

B's one day work = 1/60

C can do it in 45 days.

C's one day work = 1/45

(A + B + C)'s one day work = 1/20 + 1/60 + 1/45

= (9 + 3 + 4)/180

= 16/180

= 4/45

Hence,

All three persons working together can do it in 11.25 days or 11 days 6 hours.