Calc problems from a young middle-class suburban Korean boy

[RobinK]

A bug stands atop a 2 1/4 in diameter pool ball which sits in the middle of a 6 in diameter flat paper disk. The bug stands upon the ball and just barely sees the edge of the paper disk. How tall is the bug?
Answer: 0.368 in

A recipe for a dozen 2-in mild jalapeno cornbread muffins calls for 2 jalapenos. How many jalapenos are needed to make a gross (144) of 3-in spicy jalapeno cornbread muffins if spicy dough has 3 times as many jalapenos as mild dough?
Answer: 243

Frank practices throwing horseshoes by tossing shoes at five-ft intervals starting at 10 ft. His tosses measured 9.1 ft, 17 ft, 18 ft, 24 ft and 29 ft. What distance should he aim for if he wants to throw a "ringer" at 40 ft?
Answer: 42.0 ft

It takes Abe 42 min to row his boat 3 mi up river. He rows back to where he started in 18 min. What is the river velocity?
Answer: 2.86 mph

Thanks.

[ZekeusAurelius]