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# Two carpenters, working in the same pace, can build 2 desks in two hou

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Math Expert
Joined: 02 Sep 2009
Posts: 54371
Two carpenters, working in the same pace, can build 2 desks in two hou  [#permalink]

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17 Jun 2016, 05:31
00:00

Difficulty:

15% (low)

Question Stats:

82% (01:45) correct 18% (02:05) wrong based on 160 sessions

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Two carpenters, working in the same pace, can build 2 desks in two hours and a half. How many desks can 4 carpenters build in 4 hours?

A. 2.4.
B. 3.6.
C. 4.2.
D. 5.5.
E. 6.4

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Posts: 19
Location: United Arab Emirates
Re: Two carpenters, working in the same pace, can build 2 desks in two hou  [#permalink]

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17 Jun 2016, 05:39
1
1
W = 2 desks
T = 2.5 hrs
Rate of 2 carpenters = 2×R

Rate = work done/ time

2xR = 2/2.5

R = 1/2.5 = 2/5 (this is the rate of each carpenter)

Work done by 4 carpenters in 4 hrs = 4 × rate of each carpenter x time = 4× 2/5 × 4 = 6.4 desks

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Re: Two carpenters, working in the same pace, can build 2 desks in two hou  [#permalink]

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17 Jun 2016, 05:51
Combined :-

R = 2x
t = 2.5
w = 2

r x t = w

2r= 2/2.5 = 1/2.5 = 2/5 = rate of 1 carpenter.

For 4 carpenters working for 4 hours
R = 4 x (2/5)
and T = 4
Therefore R x T = W
=>4 x 2/5 X 4
=> 32/5 = 6.4
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Re: Two carpenters, working in the same pace, can build 2 desks in two hou  [#permalink]

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31 Aug 2017, 21:32
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Re: Two carpenters, working in the same pace, can build 2 desks in two hou   [#permalink] 31 Aug 2017, 21:32
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