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The specific speed of a centrifugal pump, delivering 750 litres of water per second against a head of 15 metres at 725 r.p.m., is

24.8 r.p.m.
48.2 r.p.m
82.4 r.p.m.
248 r.p.m

Correct Answer: 82.4 r.p.m.

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