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13 Jun 2016, 19:36
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Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
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Wheels of diameters 7cm and 14cm start rolling simultaneously from x & y which are 1980 cm apart towards each other in opposite directions. Both of them make the same number of revolutions per second. If both of them meet after 10seconds.The speed of the smaller wheel is
A) 22m/s B) 33m/s
C) 44m/s D) 55m/s
A) 22m/s B) 33m/s
C) 44m/s D) 55m/s
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This topic has been closed and archived due to inactivity or violation of community quality standards. No more replies are possible here.
Where to now? Join ongoing discussions on thousands of quality questions in our Problem Solving (PS) Forum
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13 Jun 2016, 20:20
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Hi Vivek7g,
To start, when posting PS questions, you should post them in the PS sub-Forum here:
gmat-problem-solving-ps-140/
What is the source of this question? I ask because it's not written in typical GMAT "style." If you're actually studying for the GMAT, then you might want to invest in more realistic practice materials.
GMAT assassins aren't born, they're made,
Rich
To start, when posting PS questions, you should post them in the PS sub-Forum here:
gmat-problem-solving-ps-140/
What is the source of this question? I ask because it's not written in typical GMAT "style." If you're actually studying for the GMAT, then you might want to invest in more realistic practice materials.
GMAT assassins aren't born, they're made,
Rich
13 Jun 2016, 20:37
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Vivek7g
Hi,
Your answers are flawed.....
the Q is talking of cm and answer is given in m/s......
even if I take the smallest speed given, speed = 22m/s or 220cm/s....
so in 10 secs it will travel 220*10 = 2200 cm which alone is MORE than total distance of 1980 cm..
Be careful with the source you are using..
Solution-
Let the # of revolutions be n in 1 sec....
so smaller travels = \(7*pi*n*10 = 70*n*\frac{22}{7}= 220n\)......
bigger travels = \(14*pi*n*10.......140*n*\frac{22}{7} = 440n\)
But total they travel = 1980......... so.\(220n+440n = 1980 ........ n = \frac{1980}{660} = 3\)..
so smaller wheel travels 22*3 cm in 1 secs..... speed = 66 cm/s
