A Grinding wheel of 150mm diameter is rotating at 3000 r.m.p. The grinding speed is
(a)7.5$\pi m/s$ (b) 15 $\pi m/s$
(c)45$\pi m/s$ (d) 450 $\pi m/s$
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(b) 15 $\pi m/s$ 
(d) 450 $\pi m/s$