bobdylan wrote:Working alone, printing presses A,B and C can fill the daily allotment of newspapers in 8,10, and 12 hours, respectively. What is the ratio of the time it takes press A to fill the allotment working alone to the time it takes presses B and C to fill the allotment together at their respective rates?
a) 11:4
b) 22:15
c) 15:22
d) 4:11
e)1:11
Let the allotment = 60 units.
Rate for B alone = 60/10 = 6 units per hour.
Rate for C alone = 60/12 = 5 units per hour.
Combined rate for B+C = 6+5 = 11 units per hour.
Time for B+C together = 60/11.
(time for A)/(time for B+C) = 8/(60/11) = 88/60 = 22/15.
The correct answer is
B.
Private tutor exclusively for the GMAT and GRE, with over 20 years of experience.
Followed here and elsewhere by over 1900 test-takers.
I have worked with students based in the US, Australia, Taiwan, China, Tajikistan, Kuwait, Saudi Arabia -- a long list of countries.
My students have been admitted to HBS, CBS, Tuck, Yale, Stern, Fuqua -- a long list of top programs.
As a tutor, I don't simply teach you how I would approach problems.
I unlock the best way for YOU to solve problems.
For more information, please email me (Mitch Hunt) at
[email protected].
Student Review #1
Student Review #2
Student Review #3
