Qualification > Math

Math question really stuck

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Ghost Of Highbury:
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?

Ghost Of Highbury:
anyone dere..

nid404..plz help..!!

astarmathsandphysics:
I cant find this question where is it?

Ghost Of Highbury:
i got it from a practice book...

godfather93:
there is no other hint?

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