Q.28 :-Tap A can fill a tank in 60 minutes while tank B can fill it in 90 minute. The opening at the bottom can empty the full tank in 3 hours. When the tank was empty both the taps were opened to fill the tank. After 15 minutes it was detected that the opening at the bottom was left unblocked and
immediately it was closed. After how much more time was the tank completely filled ?
24 minutes
27 minutes
21 minutes
30 minutes

Suppose you are a freshmen in college and you have not declared a major. one reason you enrolled at your respective college was the school's vibrant social life. at the same time, you want to balance your academic life because you know that your grades will matter for graduate school or job applications.you decide to forgo partying for two hours to study for an upcoming economics exam. in your first semester's principles of economics class, you learn that the enjoyment you would have received from partying is an example of a(n)