Question

If a tap emties a tank in 40 mins then how long it will take to empty the full tank with a tap twice its diameter

Answer 1

Answer:

If both Pipes A and B are open they empty (1/40)+(1/10) = (10+40)/(10*40) = 50/400 = (1/8)th of the tank in 1 min. Thus Pipes A and B together will empty the same tank in 8 mins..............................