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12 December, 19:08

A machine produces 312 bolts in 30 minutes. At the same rate, how many minutes would it take to produce 260 bolts?

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  1. 12 December, 19:29
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    312 bolts in 30 mins

    or 312 bots in 1800 seconds

    Time for 1 bolt is 1800 / 312 = 5.77secs (rounded to two figures)

    260 bolts would take:

    260 x 5.77 = 1500secs (rounded)

    1500secs = 1500 / 60 mins = 25mins
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