Problem 4 · 1999 AMC 8
Easy
Ratios, Rates & Proportions
graph-reading
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Answer: A — About 15 miles.
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Hint 1 of 2
The word "more" means a gap, and a gap on a graph is a vertical distance. Go to Hours = 4 and look at how far apart the two lines sit there.
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Hint 2 of 2
Read each line's height at the 4-hour line, then subtract — you don't need the actual mileages anywhere else.
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Approach: the 'how much more' is the vertical gap at 4 hours
- Slide up the vertical line at Hours = 4. Alberto's line is at about 60 miles, Bjorn's at about 45.
- "How many more" is the gap between them: 60 − 45 = 15 miles.
- Reading tip you'll reuse: a difference question on a graph is always a vertical gap at one chosen x-value — find that x, then measure straight up between the curves. Steeper line = faster rider, which is why Alberto pulls ahead.
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