What fraction of 1hour is 48min?

What fraction of 1hour is 48min?
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Answer :

48/60 = 12/15 = 4/5
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Two faucet can fill a tank in 12hours and 16 hours .While a third faucet empties the full tank in 24 hours.If all the three faucet are operate simultaneously, In how much time will the tank be filled ? A) 4 hours 12mins B) 4hours 48min C) 9hours 36mins D) 5hours 48min

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