Question

A B and c can do a work in 90,30,45 days respectively.if they work together in how many days will they complete work?
options:
a. 15
b. 10
c. 20
d. 25​

Answer 1

Answer:

B's 1-day work = 1/30. Given that C can do a piece of work in 45 days. C's 1-day work = 1/45. = 1/15.