A certain crop needs 3 cumec of water for irrigating 5100 hectares land up to 10 cm depth. Total 12 watering at an interval of 10 days are needed. Duty and delta (in hectare/cumec and cm respectively) will be:
1
51000, 1200
2
15300, 0.12
3
1700, 120
4
510, 1.2