A cylindrical overhead tank of radius 2 m and height 7 m is to be filled from an underground tank of size $5.5\text{ m} \times 4\text{ m} \times 6\text{ m}$ . How much portion of the underground tank is still filled with water after filling the overhead tank completely ?

$1/3$

$1/2$

$1/4$

$1/6$

Kepler. Discussing PYQs. Q.no. 73

A cylindrical overhead tank of radius 2 m and height 7 m is to be filled from an underground tank of size 5.5 m×4 m×6 m5.5\text{ m} \times 4\text{ m} \times 6\text{ m}5.5 m×4 m×6 m . How much portion of the underground tank is still filled with water after filling the overhead tank completely ?