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01-06-2015
Mathematics

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

Respuesta :

01-06-2015

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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