Question

Water is flowing at the rate of 3 km/hr through a circular pipe of 20cm internal diameter into a circular cistern of diameter 10m and depth 2m in how much time will the cistern be filled??

Answer 1

nswer:

5/3 hr

Step-by-step explanation:

Volume of water passing through the pipe in a hour

V = лr²h

r = 20/2 cm = 10 cm = 1/10 m

h= 3 km = 3000 m

v = л * 1/10 * 1/10 * 3000 = 30л

volume of cistern

r = 10/2 = 5 m

h = 2 m

v = л * 5 * 5 * 2 = 50л

needed time = 50/30 = 5/3 hr

Answer 2

Answer:

Step-by-step explanation:

5/3 hr

Step-by-step explanation:

Volume of water passing through the pipe in a hour

V = лr²h

r = 20/2 cm = 10 cm = 1/10 m

h= 3 km = 3000 m

v = л * 1/10 * 1/10 * 3000 = 30л

volume of cistern

r = 10/2 = 5 m

h = 2 m

v = л * 5 * 5 * 2 = 50л