Campus Maths Puzzle Numerical Ability Time and Work

Tap A can fill the tank in 20 hours and tap B can fill in 10 hours. An outlet tap C at the bottom can empty the tank in 15 hours and another outlet tap D, at the middle, can empty it in 25 hours. At first, taps A and C were opened for 15 hours and then B and D were also opened. After how much time, from the beginning, would the tank be filled?

Read Solution (Total 2)

Campus Other Question
Q. A lady's age between 50 and 70.each of her son has many sons as his brothers. The sum of the sons and the grandsons is the lady's age. What is her age?? A refrigerator contains 12 cans.7 blue cans and 5 red cans. In how many ways can we remove 8 cans from the refrigerator so that at least 1 blue can and red can remains in the refrigerator.