Question

halo it's me Sam
Question:-
Three pipes A,B and C can fills a tank in 12 hours, 15 hours and 20 hours respectively. How long would the three pipes take to fill the empty tank, if all of them are opened together?

please lemme know the correct ans I need it!!
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Answer 1

Answer:

Answer is 7

Step-by-step explanation:

Tap A fills the tank in 12 hrs

tap A fills the tank in 1hour 1/12 of the tank

tapB fills the tank in 1 hour 1/15 and tap C fills the tank in 1hrs 1/20 of the tank .

in two hours 1/12+1/12+1/15+1/20 of the tank filled by A B C tap

=(5+5+4+3)/60=17/60

in 6 hrs 3×(17/60) =51/60 of the tank will be filled .

remaining (1–51/60)=9/60 of the tank .

now A and B tap is running to fill the rest 9/60 of the tank .

1/12+1/15 =(5+4)/60=9/60 of the tank is filling by A and B in 1hour

so rest will filled up by A and B in 1 hour

total tank will be filled in (6+1)hour =7 hour

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