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.
203दिन
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.
7दिन
24
C.
33दिन
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