Question

3. Pipe A can fill the tank in 45 min and pipe B can empty the tank in 1 hr 30 min. If pipe B is opened after 30 min of start of pipe A, what is the total time required to fill the tank? ​

Answer 1

Answer:

30+45+1:45=3:00aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa