Question

two pines A and B can fill a tank in 15 hour and 10 h respectively. a tap C can empty it in 30 hrs . All the three pipes were opened for 2 hrs, when it was remembered that the emptying tap had been left open. It was then closed. . How many hrs more would it take for the tank to be filled?

Answer 1

A 1days workis one day's work equal 1.15 and b is equal to 3 and 1 decimal equal one upon 30 and required how was for would it take for the time to be paid one upon 15 + 1 upon 10 minus one upon 3 equal one upon 30