If circular means circumference of tap, then the tank with two one cm circular drain outlets will drain faster - 2 times faster than the one with a one two cm circular drain outlet.Originally Posted byvenuspop

r = Small pipe radius = 1/2pi

R = Big pipe radius = 1/pi

Area of small pipe = 1/4pi

Area of big pipe = 1/pi

2 times area of small pipe = 1/2pi

Hence 1 big pipe flows 2 times faster than 2 small pipes since time and height of pipe is constant.