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Posted by on Friday, October 21, 2011 at 9:09am.

a tank can be filled by one pipe in 3.5 hours and emptied by another in 4.2 hours. if both pipes are running, how long will take to fill an empty tank ?

  • maths - , Friday, October 21, 2011 at 9:26am

    rate=amount/time

    rate combined=sum of rates=1tank/3.5hr+1tank/4.2hrs

    rate combined=(4.2+3.5)/(3.5*4.2) tanks/hr work this out.

    time= 1tank/(above rate)

  • maths - , Friday, October 21, 2011 at 12:54pm

    I also misread the problem. It is being emptied at 4.2 hrs.

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