Author Topic: Math question really stuck  (Read 1478 times)

Offline Ghost Of Highbury

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Math question really stuck
« 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?
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Offline Ghost Of Highbury

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Re: Math question really stuck
« Reply #1 on: May 18, 2009, 07:22:50 am »
anyone dere..

nid404..plz help..!!
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Offline astarmathsandphysics

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Re: Math question really stuck
« Reply #2 on: May 18, 2009, 07:24:20 am »
I cant find this question where is it?

Offline Ghost Of Highbury

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Re: Math question really stuck
« Reply #3 on: May 18, 2009, 07:25:48 am »
i got it from a practice book...
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Offline godfather93

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Re: Math question really stuck
« Reply #4 on: May 18, 2009, 07:26:23 am »
there is no other hint?

Offline O.T.13.

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Re: Math question really stuck
« Reply #5 on: May 18, 2009, 07:26:49 am »
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
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Offline Ghost Of Highbury

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Re: Math question really stuck
« Reply #6 on: May 18, 2009, 07:27:58 am »
the answer is 20...don't know how they solved it,,,
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Offline astarmathsandphysics

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Re: Math question really stuck
« Reply #7 on: May 18, 2009, 07:28:41 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?

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

Offline Ghost Of Highbury

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Re: Math question really stuck
« Reply #8 on: May 18, 2009, 07:28:47 am »
no more hints given,,,
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Offline Ghost Of Highbury

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Re: Math question really stuck
« Reply #9 on: May 18, 2009, 07:29:52 am »
okk..
thanks a lot astar..
really good explanation

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