7. Suppose there is a water reservoir, filled with water, with a length of 7 m, a width of 10 m and a depth of 5 m. All the water from the reservoir is spread over a rice field of 1 hectare (10 000 m2). Calculate the water depth in the field. a.0.035m b. 0.045m C. 0.055m d. 0.030m​