# Water is flowing at the rate of 2.52 km/h through a cylindrical pipe into a cylindrical tank, the radius of whose base is 40 cm. If the increase in the level of water in the tank, in - Mathematics

Water is flowing at the rate of 2.52 km/h through a cylindrical pipe into a cylindrical tank, the radius of whose base is 40 cm. If the increase in the level of water in the tank, in half an hour is 3.15 m, find the internal diameter of the pipe.

#### Solution

Increase in the level of water in half an hour, h = 3.15 m = 315 cm

Radius of the water tank, r = 40 cm

Volume of water that falls in the tank in half an hour = πr2h

= π×402×315

= 5,04,000π cm3

Rate of flow of water = 2.52 km/h

Length of water column in half an hour =2.52/2 = 1.26 km = 1,26,000 cm

Let the internal diameter of the cylindrical pipe be d.

Volume of the water that flows through the pipe in half an hour = pi xx(d/2)^2xx126000cm^2

We know

Volume of the water that flows through the pipe in half an hour = Volume of water that falls in the tank in half an hour

=>pixx(d/2)^2xx126000= 504000pi

=>(d/2)^2=4

=>d^2=16

=>d= 4 "cm"

Thus, the internal diameter of the pipe is 4 cm.

Concept: Concept of Surface Area, Volume, and Capacity
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#### APPEARS IN

RD Sharma Class 10 Maths
Chapter 14 Surface Areas and Volumes
Exercise 14.1 | Q 53 | Page 31