Problem: Two sister cities were both situated on plate boundaries, close to volcanoes, on different continents. Red city was 10 miles from a volcano, while Tree city was 60 miles away. Red city experienced many earthquakes, Tree city few and far between. Which city experienced less convection within the Earth causing the plates to move?

A: Tree

Problem: John wanted to charge his electronic gadgets remotely. To that end, he first conducted two experiments, case A and case B. In case A he used conduction, and in case B he used induction. In both cases he used same two objects. Finally, John tried to charge his phone remotely. He called this test as case C. Would the objects be closer to or farther from each other in case B than in case A?

A: farther from

Problem: There are two hydroelectric dams in North Dakota. Both of them has large lakes or reservoirs, reservoir A and reservoir B. Since North Dakota has one the lowest unemployment rates in the country, it's hard to find an engineer to regulate and maintain the reservoirs. This year reservoir A could hire an engineer, but reservoir B failed to find an engineer. As a result, there is no one to regulate reservoir B. The engineer for reservoir A let the water out in the fall. But there was no one to do that for reservoir B. Which reservior would most likely have excellent water quality, reservoir A or reservoir B?

A: reservoir A

Problem: Michael and Robert, two high school sprinters, competed in the 800m sprint earlier today. Both were attempting to implement the negative split strategy, though with varying degrees of success. Both Michael and Robert competed the first 400m of the 800m sprint in 2 minutes, but Michael completed the last 400m in 1 minute and 30 seconds, while Robert completed the last 400m in 1 minute and 45 seconds. Which athlete had a larger negative split?

A:
Michael