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Jamil fills 1/30 of the pool in one minute. Ali fills 1/45 of the pool in one minute. Tariq fills 1/60 of the pool in one minute. So, together they fill 1/30 + 1/45 +1/60 = 6/180 + 4/180 +3/180 = 13/180 of the pool in one minute. Therefore, it takes them 180/13 minutes to fill th pool together. That is, 13.85 minutes.
In one minute: Jim fills 1/30, Sue fills 1/45 and Tony fills 1/90, so between them in 1 minute they fill 3/90 + 2/90 + 1/90 ie 6/90 or 1/15 so working together it will take 15 minutes.
sand
bunn has several but they are pricy
chis fills (1/30) of the pool every minute.Sarah fills (1/45) of the pool every minute.Billy fills (1/90) of the pool every minute.Working together, they fill [ (1/30) + (1/45) + (1/90) ] every minute.(1/30) + (1/45) + (1/90) = (3/90) + (2/90) + (1/90) = (6/90) = 1/15Together, they fill (1/15th) every minute, so it takes 15 minutes to fill it completely.
Spinal fluid. One teaspoon every 5 minutes.
It is called cytoplasm.
F1 fills one-eighth per minute, F1 & F2 together fill one-fifth per minute, so F2 is responsible for one-fifth less one-eighth ie three-fortieths per minute so F2 alone would take 40/3 ie 13 min 20 sec.
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The cistern is not filling up. There may be a tap beside the cistern that has been turned off. Otherwise track back along the pipe to find where the water is blocked. You may have to get a plumber. It may be that the cistern actually fills very slowly. Check if it has filled after 10 minutes.
it wouldn't overflow