X and Y can do a piece of work in 20 days and 12 days
respectively. X started the work alone and then after 4 days Y
joined him till the completion of the work. How long did the
work last? Answer: Option B Hence, total time taken = (6 + 4)
days = 10 days. A is 30% more efficient than B. How much time
will they, working together, take to complete a job which A
alone could have done in 23 days? Ratio of times taken by A and
B = 100 : 130 = 10 : 13. Suppose B takes x days to do the work.
Therefore, A and B together can complete the work in 13 days.
Ravi and Kumar are working on an assignment. Ravi takes 6 hours
to type 32 pages on a computer, while Kumar takes 5 hours to
type 40 pages. How much time will they take, working together on
two different computers to type an assignment of 110 pages?
Answer: Option D A, B and C can complete a piece of work in 24,
6 and 12 days respectively. Working together, they will complete
the same work in: Sakshi can do a piece of work in 20 days.
Tanya is 25% more efficient than