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Three printing presses, R, S, and T, working together at their respective constant rates, can do a certain printing job in 4 hours. S and T, working together at their respective constant rates, can do the same job in 5 hours. How many hours would it take R, working alone at its constant [...]
Written by Take GRE Team on April 20th, 2007 with
6 comments.
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Three printing presses, R, S, and T, working together at their respective constant rates, can do a certain printing job in 4 hours. S and T, working together at their respective constant rates, can do the same job in 5 hours. How many hours would it take R, working alone at its constant rate, to do the same job?
A) 8
B) 10
C) 12
D) 15
E) 20
GRE Question of the Day by Take GRE Team on April 20th, 2007 with
6 answers.
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den
#2.
July 23rd, 2006, at 5:35 PM.
R — r hrs …. 1 work
1 hr — 1/r of work
1 hr — > 1/r + 1/s + 1/t = 1/4
1/r + 1/5 = 1/4
r =20
sateesh_rahul
#3.
July 24th, 2006, at 12:10 AM.
answer=20
GIVEN
1/r+1/s+1/t=1/4
1/s+1/t=1/5
so..1/s=1/4-1/5=1/20..
so in a dat s can do 1/20 of work..so it takes 20 days for full work
hesperus
#4.
July 24th, 2006, at 12:25 AM.
20
Take GRE Team
#5.
July 24th, 2006, at 6:26 AM.
any simple approach pls
yadav
#6.
April 20th, 2007, at 7:24 PM.
i think this is the simplest.
as mentoned by sateesh
1/r+1/s+1/t=1/4
1/s+1/t=1/5
so..1/s=1/4-1/5=1/20..
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#1. July 23rd, 2006, at 1:14 PM.
E)20