4 hours. 280/70=4
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20.3571
(60 × 4) + 45 = 285 minutes Method: There are 60 minutes in 1 hour: 60 minutes x 4 hours equals 240 minutes. There are 45 minutes in 3 quarters of 1 hour. Therefore, add 240 and 45 which equals 285 minutes.
570
√285 = 16.881943
To find two numbers that multiply to 285, we need to factorize 285 into its prime factors. Breaking down 285, we get 3 x 5 x 19. Therefore, the two numbers that multiply to 285 are 5 and 57, as 5 x 57 = 285.