Water flows in a tank `150 m `xx`100m ` at the base, through a pipe whose cross-section is `2dm by 1. 5 dm ` at the speed f `15 km per hou r` . In what time, will the water be `3 metres deep ?`

Explanation

Answer
Volume of water in the tank, when depth is of 3m,

`V=150 xx 100 xx 3=45000m^3`
Rate of volume of water flowing `=2 xx 1.5 xx 1010- 2 xx 15000 (m^3)
/(hr)=450(m^3)/(hr)`
Thus, time taken `=
45000/450hr=100` hours