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A window cleaner cleans 4 windows/hr. New equipment increases speed by 50%. How long to clean 30 windows now?

Correct answer: C. 5 hrs

  • A. 4 hrs
  • B. 3 hrs
  • C. 5 hrs
  • D. 5.5 hrs

Explanation

The window cleaner originally cleans 4 windows per hour. With the new equipment, the speed increases by 50%, leading to a rate of 4 + (0.5 * 4) = 6 windows per hour. To clean 30 windows at this rate, the time required is 30 windows / 6 windows per hour = 5 hours. Therefore, Option C is correct. Options A, B, and D are incorrect as they are based on miscalculations or incorrect assumptions of the new cleaning rate.

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Logical problems present several conditions about people, objects, events or choices and require their possible arrangements to be tested. They cover constraint-based reasoning, rankings, matching, grouping, scheduling and elimination, with attention to the difference between a complete solution and a possibility that merely satisfies one condition.

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