Question

Rainfall measuring 4.2 cm on a flat roof with dimensions 4 m × 6 m is collected in a rectangular tank with 3.2 m × 1.5 m in dimensions. Assuming no loss of water due to evaporation, find the depth of water in the tank in mm.

Answer 1

Let depth be x,
Then volume is same in both cases,
0.042×4×6=3.2×1.5×x.... On solving x=210mm