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18 Jan 2019, 01:13
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B
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
15%
(low)
Question Stats:
86% (01:30) correct
14%
(01:54)
wrong
based on 106
sessions
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Date
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Working at a constant rate, a cook can create a batch of pasta in 20 minutes. Another cook, working at a constant rate, can create the same batch of pasta in 10 minutes. If the two cooks work together but independently, how many hours will it take them to create 3 batches of pasta?
A 1/4
B 1/3
C 1/2
D 3/5
E 2
A 1/4
B 1/3
C 1/2
D 3/5
E 2
18 Jan 2019, 03:50
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Bunuel
First cook takes 20 mins to create a batch of pasta.
Second cook takes 10 mins to create a batch of pasta.
They are working together to create 3 batches of pasta.
First cook = 1 batch ...........20 mins.
In this 20 mins second cook creates 2 batch of pasta.
Total : 3 batches.
20/60 = 1/3 hr.
B is the correct answer.
Archit3110
18 Jan 2019, 09:46
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Bunuel
combined rate:
1/20 + 1/10 = 3/20 * 60 = 9 or say 1/9 hours
1/9 * 3/1 = 1/3
IMO B
