A runner covers 10 laps in 40 minutes. If he slows down after lap 6 by 25%, how long does he take for 10 laps?
Correct answer: C. 47
- A. 45
- B. 46
- C. 47
- D. 48
Explanation
The runner covers 10 laps in 40 minutes, meaning each lap initially takes 4 minutes (40 ÷ 10 = 4). For the first 6 laps, he takes 24 minutes (6 × 4 = 24). After the 6th lap, his speed decreases by 25%, increasing each lap time to 5 minutes (4 + (0.25 × 4) = 5). Thus, the last 4 laps take 20 minutes (4 × 5 = 20). Therefore, the total time for 10 laps is 44 minutes (24 + 20). Option C (47) is correct as it correctly calculates the adjusted time. Options A (45), B (46), and D (48) miscalculate the slowdown impact, resulting in incorrect total times.
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