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CBSE XI
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Math
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Trigonometric Functions
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The wheel of a railway carriage is 40cm in diameter and makes 6 revolutions in a second. How fast is the train going?
$\begin{array}{1 1}(A)\;20cm/sec\\(B)\;24\pi cm/sec\\(C)\;24cm/sec\\(D)\;20\pi cm/sec\end{array} $
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