A water treatment plant of capacity, 100000 m3 /day has filter boxes of dimensions 10 m × 10 m. The loading rate for the filters is 100 m3 /day/m2. When five of the filters are out of service for back washing, the loading rate (in m3 /day/m2) is:
1
400
2
150
3
300
4
100
5
200