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Tube 1 drops 2 marbles per minute starting at 8:05. Tube 2 drops 5 mar

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Math Expert
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Joined: 02 Sep 2009
Posts: 61385
Tube 1 drops 2 marbles per minute starting at 8:05. Tube 2 drops 5 mar  [#permalink]

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New post 27 Apr 2017, 01:33
2
1
00:00
A
B
C
D
E

Difficulty:

  15% (low)

Question Stats:

85% (02:09) correct 15% (02:04) wrong based on 68 sessions

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Senior PS Moderator
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Joined: 26 Feb 2016
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Location: India
GPA: 3.12
Re: Tube 1 drops 2 marbles per minute starting at 8:05. Tube 2 drops 5 mar  [#permalink]

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New post 27 Apr 2017, 02:49
1
Since tube1 alone drops 2 marbles a minute for 18 minutes, we already have 36 marbles from t1 at 8:23
From 8:23, both tube 1 and 2, together drop 7 marbles in a minute
Since Jerry need 400 marbles, and 36 marbles have already been dropped.
7x(the time taken in minutes) = 400 - 36 =364
x = 52 minutes
Hence Jerry will have his 400 marbles, 52 minutes after 8:23(Option D)
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Re: Tube 1 drops 2 marbles per minute starting at 8:05. Tube 2 drops 5 mar   [#permalink] 27 Apr 2017, 02:49
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Tube 1 drops 2 marbles per minute starting at 8:05. Tube 2 drops 5 mar

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