Qualification > Math

Math question really stuck

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O.T.13.:
i think this is average
just add them and divide them by two, can't think of anything else, and there aint that much numbers to work with

Ghost Of Highbury:
the answer is 20...don't know how they solved it,,,

astarmathsandphysics:

--- Quote from: eddie_adi619 on May 18, 2009, 07:17:14 am ---heres d question : 2 pipes A and B can fill a tank in 36 hours and 45 hours respectively. If both pipes are opened simultaneously, how much time will be taken to fill the tank?

--- End quote ---

flow rate for 1 =f1 and for 2=f2  so 36f1=V and 45f2=V so f1=V/36 and f2=V/45 and total flow rate =f1+f2=V/36+V/45=81V/1620=V/20

so f=V/20 and 20f=V and time =20 hours

Ghost Of Highbury:
no more hints given,,,

Ghost Of Highbury:
okk..
thanks a lot astar..
really good explanation

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