Three persons (M, N, and O) together can complete a given work in 10/7 days. The efficiency of O is (z) times the efficiency of M. N and O working together can complete the same work in 30/11 days. M and N working together can complete a work in (y) days. If N alone can complete the work in 5 days, then
Which of the following statement(s)/ equations is/are correct regarding the values of (z), and (y)?
I. Value of z is a not prime number.
II. z > y
III. z + y > 10
1
Only I
2
Only II
3
Only III
4
Only I and II
5
Only I and III