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Maths Puzzle
Numerical Ability
Time and Work
P, Q and R can do a work in 6 hours, 7 hours, and 14 hours respectively. they together start the work 10 am P leaves after 2 hrs and Q leaves 20 minutes before completed the work and what time work will be completed?
Read Solution (Total 1)
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- p+q+r work together for 2hrs and finish 16/21 of work then p leaves
r alone work for 2o mins and finish 1/42 of work
so total (16/21)+(1/42) is done and the remaining 3/14 should be done by q+r
q+r take 1 hr to do 3/14 of work
so total time taken by (p+q+r) is 2hrs (p+q) is 1 hr and r alone is 20 mins so work started by 10 am.
10+2+1+20 =1.20pm - 10 years agoHelpfull: Yes(1) No(2)
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