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The ratio of time of return stroke to time of forward stroke of a shaping machine is 0.6. The stroke is 250 mm and it makes 30 double strokes per minute. What is the overall average speed of operation?

         (a)  3 – 75 n/min             (b) 5 – 0 m/min            (c) 7 – 5 m/min            (d) 12 m/min

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