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The ratio of the life of bearing P to the life of bearing Q is

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Two identical ball bearings P and Q are operating at loads 30kN and 45kN respectively. The ratio of the life of bearing P to the life of bearing Q is

      (a) 81/16                                                             (b) 27/8

      (c) 9/4                                                                 (d) 3/2

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