16.

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?

 A. 6 days B. 10 दिन C. 15 दिन D. 20 दिन

17.

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?

 A. 7 hours 30 minutes B. 8 घंटे C. 8 घंटे 15 मिनट D. 8 घंटे 25 मिनट

18.

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?

A. 11 days
B.

13 दिन

C.
 20 3 दिन 17
D.

इनमे से कोई नहीं

19.

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:

A.
 1 day 24
B.
 7 दिन 24
C.
 3 3 दिन 7
D.

4 दिन

20.

Sakshi can do a piece of work in 20 days. Tanya is 25% more efficient than Sakshi. The number of days taken by Tanya to do the same piece of work is:

 A. 15 B. 16 C. 18 D. 25