2 cm of rain has fallen on a square km of land. Assuming that 50% of the raindrops could have been collected and contained in a pool having a 100 m × 10 m base, by what level would the water level in the pool have increased?

A. 1 km

B. 10 m

C. 10 cm

D. 1 m

Answer: Option B

Solution(By Examveda Team)

Let the increase in level = $$x$$ m
$$\eqalign{ & \Rightarrow \left( {1000 \times 1000 \times \frac{2}{{100}}} \right) \times \frac{1}{2} = 100 \times 10 \times x \cr & \Rightarrow x = 10{\text{ m}} \cr} $$