Question

21. Two pipe can fill a cistern separately in 24 & 40 min respectively & waste pipe can drain off 30 gallons/minute. If all
the three pipes are open together, the cistern fills in 1 hr. What's the capacity of the - cistern?
(a) 550
(b) 600
(c) 450
(d) 500​

Answer 1

fret the text shows how much you love me and the other day and y s and I was so much for the first time in the text and then the next one is the best of the world to be a great day and