a tap can completly fill a cistern in 3hours.how much of it can fill in 1 hour and 30 minutes?
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It complete half of a cistern in 1 hour and 30 minutes
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a tap in 3 hour = 1 (cistern)
so in one hour it can fill 1/3. of cistern
then in 1 hour and 30 minutes or in 1.5 hours it can fill ( 1/3 ) * 1.5 = 0.5 or half of the cistern
so in one hour it can fill 1/3. of cistern
then in 1 hour and 30 minutes or in 1.5 hours it can fill ( 1/3 ) * 1.5 = 0.5 or half of the cistern
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