Question

a hemispherical tank full of water is to be emptied by a pipe at the rate of 3 litres per minute. how long will it take to empty the tank, if the diameter of the tank is 7/4m

Answer 1

volume of tank =2/3 ×22/7 ×7/8×7/8×7/8
=1.404 m^3
=14004 litres

time taken by pipe to emptied tank in 3litre =1 min
time taken by pipe to emptied tank in 14000litre =1/3. ×14004
=4668 min

Answer 2

Answer:

Step-by-step explanation

volume of water = 2/3*pi*r3

                             = 2/3* 22/7*(7/8)3

                             = 2/3*22/7*49*7/64*8

                             = 49*11/6m3

In litrres; 49000*11/6 litres

for 1 litre: 1/3 minute

for 539000/6 litres = 1/3*539000/6

ans: 29933.3 minutes