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5 days ago · Then we can find the volume of water in the tank after 2 hours when all the taps are open. Then we can find the volume filled in the next one hour, when one tap is closed. Then we can find the remaining volume to be filled and divide it by the volume filled per hour by the opened tap to get the required time.
4 days ago · Hint: Find the capacity of the tank filled by each pair of taps AB, BC and CA in 1 hour and then use the pair of taps which fills the highest capacity of tank in 1 hour to fill the remaining tank. Given that three taps A, B, C fill up the tank independently in 10 hr, 20 hr, 30 hr respectively.
3 days ago · So, Pipe A will fill up = $4 \times 24$ units $ \Rightarrow $ Pipe A fills up 96 units of the tank. Since, the tank has the volume of 144 units among which 96 are filled using Pipe A only. So, we are left to fill up 144 – 96 = 48 units using Pipe B. Since, Pipe B runs with a speed of 3 units per minute and it needs to fill up 48 units.
4 days ago · Now, we know that the 2nd tap can empty a tank in 20 minutes. We can also write the same statement as that 2nd tap can fill a tank in $-20$ minutes. So, in other words we can say that in 1minute 2nd tap can fill $\dfrac{1}{-20}$ part of the tank. So, in the question we are told that both the taps are opened together at the same time.
4 days ago · Pipes A can fill a tank with water in 30 minutes. Pipes B can fill a tank with water in 40 minutes. Pipe C can drain off 51 litres of water per minute. All the three pipes are opened together, the tank is filled in 90 minutes. Concept used: LCM method used, Calculation: According to the question: Lcm of (30, 40, 90) = 360
3 days ago · In this figure, there are two taps which are opened simultaneously. We will now find out the total time that took to fill up this cistern. So, for this we will just add up the two work done together to get the total amount of the work done by the two taps as $\dfrac{1}{4}+\dfrac{1}{3}=\dfrac{3+4}{12}=\dfrac{7}{12}$.
2 days ago · We have been given three pipes from which two are used to fill the water and the third one is used to empty the tank. The pipe A fills the tank in 3 hours individually, And pipe B fills the tank in 3 hours and 45 minutes individually. Whereas pipe C is used to empty the tank and it can empty the tank in 1 hour.
