Question

Water in a rectangular reservoir having base 80 m by 60 m i s 6.5 m deep. In what time can the water be emptied by a pipe ôf which the cross-section is a square of side 20 cm, if the water runs through the pipe at the rate of 15 km/hr.

Answer 1

Given that,
Flow of water = 15km / hr
=15000m/hr.
Volume of water coming out of the pipe in one hour
`20/100xx20/100xx± 5000=600m^3`

`"Volume of the tank"= 80xx60xx6.5`

`=31200m^3`
∴Time taken to empty the tank
`="Volume of tank"/"volume of water coming out of the pipe in one hour"`
`=31200m^3`

`=52  hours.`