A tank has three inlet valves p,q,r to fill in water. If p or q or r one at a time is opened the tank will be filled in 6 hours, 3 hours and 2 hours respectively. How much time will be taken to fill the tank, if all the three valves are opened at a time
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Explanation:
Tank p individual time=6
work done in one hour=1/6
Tank q individual time =3
work done in one hour=1/3
Tank r individual time =2
work done in one hour=1/2
time taken by all three
1/6+1/3+1/2= 1
therefore the three taps take 1 hour when opened together
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