Question

A water flows at a rate of 5m per minute through a cylindrical pipe whose diameter is 7cm.How long will it take to fill the conical vessel of diameter as 21m and depth 12m.

Answer 1

There could be a correction I guess as it says 5m per minute instead of 5 litre per minute, Because you cannot compare the volume in meter, it should be in litres or meter cube.
Though
Volume of Conical vessel is = πr^2h/3
put r =21/2
h=12
π = 22/7
We'll get V = 1386 m^3

1 ) Now I consider it as 5litres per minute
As we know
1m^3 = 1000 Litres
Which gives 1386 m^3 = 1386000 litres
Now given that 5 litres per minute
Thus 1386000/5 = 277200 minutes

2 ) Now considering it to be 5 m^3 per minute
Thus for 1386 it takes 1386/5 = 277.2 minutes

Do revert back if I'm mistaken

Answer 2

Answer:

Time taken = 5 mins

Step-by-step explanation:

Given:

Water flows at the rate of 0.5m/min

Internal radius of the pipe = 2 cm

Radius of the conical vessel = 10 cm

Depth of the conical vessel = 30 cm

To Find:

Time taken to fill the conical vessel

Solution:

First find the volume of water that flows out through the pipe in 1 min.

Here the pipe is in the shape of a cylinder.

Volume of a cylinder is given by,

Volume of a cylinder = π × r² × h

where r is the radius

and h is the height

Here height of the pipe = 0.5 m = 50 cm

Substitute the data,

Volume of water that flows out in 1 min = π × 2² × 50

⇒ 200 π cm³

Now the vessel is in the shape of a cone.

Volume of a cone is given by,

Volume of a cone = 1/3 × π × r² × h

Substitute the given data,

Volume of the cone = 1/3 × π × 10² × 30

Volume of the cone = 1000 π cm³

Now let the conical vessel be filled in x mins.

Hence,

Volume of water that flows out in x mins = Volume of the vessel

Substitute the data,

200 π × x = 1000 π

200 x = 1000

x = 1000/200

x = 5 mins

Hence the time taken to fill the conical vessel is 5 mins.