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A Rectangular Tank is 80 M Long and 25 M Broad. Water Flows into It Through a Pipe Whose Cross-section is 25 Cm2, - Mathematics

A rectangular tank is 80 m long and 25 m broad. Water flows into it through a pipe whose cross-section is 25 cm2, at the rate of 16 km per hour. How much the level of the water rises in the tank in 45 minutes.

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Solution

Let the level of water be risen by h cm.
Then,
Volume of water in the tank = `8000xx2500xxhcm^2` 
Area of cross – section of the pipe =`25cm^2`
 Water coming out of the pipe forms a cuboid of base area `25cm^2` and length equal to the distance travelled in 45 minutes with the speed 16km/hour.

i.e., length=`16000xx100xx45/60cm`
∴Volume of water coming out of pipe in 45 minutes
`=25xx16000xx100(45/60)`

Now, volume of water in the tank = volume of water coming out of the pipe in 45 minutes

`⇒8000xx2500xxh=16000xx100xx45/60xx25`

`⇒h=(16000xx100xx45xx25)/(8000xx2500xx60)cm=1.5cm.`

Concept: Volume of a Cuboid
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APPEARS IN

RD Sharma Mathematics for Class 9
Chapter 18 Surface Areas and Volume of a Cuboid and Cube
Exercise 18.2 | Q 27 | Page 31
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