Time and work

Quantitative Aptitude (RRB NTPC)

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Three printing press P, Q and R can print 1 lack books in 5 hrs, 15 hrs and 10 hrs respectively. If all the press starts at 10 am and press R is stopped after 2 hrs then at what time work will be complete.

12 pm

1 pm

2pm

3pm

Explanation:

Answer & Solution
Answer – 1 pm
Solution:
Time taken by P = 5hrs, Q = 15hr and R = 10 hrs
(1/5+1/15+1/10)*2 + (1/5 + 1/15)*X = 1 (X = time taken to do remaining work)
after solving we get X = 1. So 2+1 = 3hrs. i.e at 1pm work will be completed.

By: Manpreet kaur

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