A table lists ship speeds: A 18, B 22, C 20, D 24 knots. If they travel for 3 hours, which ship travels farthest and how far?

• A. Ship B; 66 nautical miles
• B. Ship A; 54 nautical miles
• C. Ship D; 72 nautical miles
• D. Ship C; 60 nautical miles

Answer: (C)

The key idea is distance equals speed times time. In 3 hours, each ship covers:

• 18 knots × 3 = 54 nautical miles

• 22 knots × 3 = 66 nautical miles

• 20 knots × 3 = 60 nautical miles

• 24 knots × 3 = 72 nautical miles

The farthest distance is 72 nautical miles, which comes from the ship traveling at 24 knots. So the correct description is the one that states 24 knots for 3 hours, yielding 72 nautical miles.