Question

A work can done by A and B in 10 days,
B and C in 5 days, C and A in 30 days
then in how many days can A, B and C
together finish the work ?
(1) 3 Days (2) 6 Days
(3) 8 Days (4) 5 Days
​

Answer 1

1/5+1/10+1/30

6+3+1/30

10/30

10/30*2

so andwer is. 6 days

Answer 2

A,B,C take 8 days to finish work together