A courier sorts 120 packages in 3 hours. During peak season, speed drops by 25%. How long for same task?
Correct answer: B. 4
- A. 3.5
- B. 4
- C. 4.2
- D. 4.5
Explanation
Initially, the courier sorts 120 packages in 3 hours, at a rate of 40 packages per hour. During peak season, the speed decreases by 25%, reducing the rate to 75% of the original speed, which is 30 packages per hour. To calculate the time required to sort 120 packages at the reduced speed, divide the total work (120 packages) by the new rate (30 packages per hour), resulting in 4 hours. Therefore, option B is correct. Options A, C, and D either underestimate or overestimate the time required due to incorrect calculations of the speed reduction.
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