A swimming pool 70 m long, 44 m wide, and 3 m deep is filled by water issuing from a pipe of diameter 35 cm at 6 m per second. The time taken to fill the pool is:

Find the approximate volume and surface area of a sphere of radius 6 cm. (Use π = 227)

Ram has two spherical balls of radius 10.5 cm each and Meena has six spherical balls of radius 7 cm each. What is the total volume of the balls that Meena has?