Question

A pipe can fill a tank in 'a' hours and another pipe can empty it in 'b' hours . If b > a then how much time will it take to fill the tank together by a and b ?

plz help me quickly and explain me ans ​

Answer 1

Answer:

I think answer is 1 hour 1/2 hour

Answer 2

Answer:

1 hours for a to fill the tank and 2