Question

A tank can be filled by two taps X and Y in 5
hrs and 10 hrs respectively while another tap Z
empties the tank in 20 hrs. In how many hours
can the tank be filled if all 3 taps are kept open?
(a) 5
(b) 4
(c) 7
(d) 8​

Answer 1

Answer:

b is the right answer........

Answer 2

Answer:

(b) 4 would be the answer. Hope it helps you .....plz follow me