For the following questions answer them individually
A tankis filled in 7 hours by three pipes X, Y, and Z. The pipe Z is twice as fast as Y and Y is twice as fast as X. How much time will pipe X alonetaketo fill the tank?
The angle of elevation of a ladder leaning against a wall is 60 degree, and the foot of the ladderis 3.60 m away from the wall. Then the length of the ladderis
A pipe, which is installed in the house drainage system to preserve the water seal of trapsis called
For treating the sewerageof a large city, which one of the following option is recommended?