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If the centre distance between a pair of spur gears in mesh is 240 mm and the pinion moves five times faster than the gear, then the pitch circle diameters of pinion and gear respectively are                                  

(a) 40mm and 200 mm

(b) 80mm and 400 mm

(c) 60mm and 300 mm

(d) 50mm and 250 mm

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