Water flows through a pipe with an inner radius of 1.4 cm at a speed of 6.3 m/sec. What is the volume of water discharged by the pipe in 30 min? (Take π = 227)

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?