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12 December, 01:44

A water wheel makes 28 revolutions in 90 seconds. how many revolutions can it make in 4 minutes?

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  1. 12 December, 04:43
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    90 seconds = 1.5 minutes

    1.5 minutes = 28 revolutions

    Revolutions in 1 minute = 28/1.5 = 18.67 revolutions

    Revolutions in 4 minutes = 18.67*4

    = 74.7 (approx.) revolutions
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