A rectangular water reservoir is `10. 8 m xx 3. 75 m` at the base. Water flows into it at the rate of `18 m/sec` through a pipe having the cross section `7. 5` cm and `4. 5` cm Find the height to which the water will rise in the reservoir in `30` minutes

Explanation

Speed of water=18 m per s

`1s=18m`

length of water`=30*60s=30*16*18m`

Volume of water filled=volume of water flowed

`18.8*3.75*x=7.5/100*4.5/100*30*16*18`

`x=24/1000=0.024m`.