A printer A can print one thousand books in 15 hours printer B can print the same number of books in...........

Quantitative Aptitude ( CCS) Time and work

A printer A can print one thousand books in 15 hours ,printer B can print the same number of books in 10 hours and printer C can print the same number of books in 12 hours . If all the printers are started to print the books at 8 A.M, After sometime printer A is closed at 9 A.M and printer B and printer C remains working. Find at what time the printing will be completed ?

4(3/11)hours

3(1/11)hours

5(1/11)hours

3(5/11)hours

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Explanation:

Solution:
Let printing completed in be T hours
Then A ‘s 1 hour work ,B’s T hours work and C;s T hours work =Total work
1/15 +T/10+T/12 =1
T= 5(1/11)
Hence ,the printing of books will be completed at 5(1/11)hours