1.

A machine P can print one lakh books in 8 hours, machine Q can print the same number of books in 10 hours while machine R can print them in 12 hours. All the machines are started at 9 A.M. while machi

Answer»

1.00 pm



(P + Q + R)'s 1 hour's work = ( 1/8 + 1/10 + 1/12 ) = 37/120 .

Work done by P, Q and R in 2 hours = ( 37/120 X 2 ) = 37/60 .

REMAINING work = ( 1 - 37/60 ) = 23/60 .

(Q + R)'s 1 hour's work = ( 1/10+ 1/12 ) = 11/60 .

Now, 11/60 work is done by Q and R in 1 hour.

So, 23/60 work will be done by Q and R in ( 60/11 x 23/60 ) = 23/11 hours is nearly EQUAL to 2 hours.

So, the work will be finished approximately 2 hours after 11 A.M., i.e., around 1 P.M.



Discussion

No Comment Found

Related InterviewSolutions