Letters jump by 3 (A→D→G→J), numbers increase by 2 (2→4→6→8), last letter shifts by 1 each time (B→E→F→G). So J8G
If all A are B and some B are C, then it's possible some A are C, but not guaranteed. Therefore, 'Some A may be C' is the logically consistent statement.
# Solution: Race Problem with Multiple Competitors
When competitors finish a race at different times, their speeds are proportional to the distances they cover in the same time period.
Step 1: Find the Speed Ratio of A and B
When A finishes the 1000m race, B is 100m behind, meaning B has covered only 900m in the same time.
Step 2: Find the Speed Ratio of B and C
When B finishes the 1000m race, C is 80m behind, meaning C has covered only 920m in the same time.
Step 3: Find the Speed Ratio of A and C
Combining the two ratios:
Step 4: Calculate C's Distance When A Finishes
When A finishes 1000m, C covers:
Step 5: Find the Difference
Wait—let me recalculate: The answer should be 180m.
Actually: $$1000 - 820 = 172m