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288 x 4 = 1,152
288 - without using a calculator ! 288/4=72
There are 60 minutes in one hour. Therefore, 288 minutes is equal to 288/60 = 4 remainder 48 or 4 hours 48 minutes.
The common factors of 288 and 420 are 1, 2, 3, 4, 6 and 12.
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