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 machine P is closed at 11 A.M. and the remaining two machine

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 machine P is closed at 11 A.M. and the remaining two machines complete work. Approximately at what time will the work (to print one lakh books) be finished ?

[A].	11:30 A.M.
[B].	12 noon
[C].	12:30 P.M.
[D].	1:00 P.M.

Answer: Option D

Explanation:

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

Work done by P, Q and R in 2 hours =		37	x 2		=	37	.
		120				60

Remaining work =		1 -	37		=	23	.
			60			60

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

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

So,	23	work will be done by Q and R in		60	x	23		=	23	hours 2 hours.
	60			11		60			11

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

Aptitude :: Time and Work : More Exercises

Time and Work - General Questions

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 machine P is closed at 11 A.M. and the remaining two machine

Aptitude :: Time and Work : More Exercises

Questions & Answers

Interviews

Jobs

Results

Admission

Admit Card

Answer Key