DV, who is quite a bully, has a prized, favorite toy - a plastic model of an ominous spherical space ship from a very old blockbuster movie. DV's neighbor, Sky, who is also the frequent victim of DV's bullying has devised a plan to get back at him. She has hooked up pump from the fish tank in DV's bedroom to a small tube and is using it to pump smelly, algae-ridden fish tank water slowly into DV's prize toy. The putrid water is being pumped at a rate of 7 cubic inches per minute and the inside of the toy space ship is a perfectly smooth sphere of radius r=9 the h r