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Unit 5 · Mathematical Reasoning and Aptitude Paper 1 · 4 September 2024 Morning

7 pumps, working 10 hours a day, can empty a tank in 20 days. How many hours a day must 5 pumps operate to empty the tank in 14 days?7 पंप, प्रतिदिन 10 घंटे कार्य करके, एक टंकी को 20 दिनों में खाली कर सकते हैं। 14 दिनों में टंकी खाली करने के लिए 5 पंपों को प्रतिदिन कितने घंटे चलना होगा?

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Correct answer: A. 20 hours20 घंटे

Explanation

Total work = 7 × 10 × 20 = 1400 pump-hours. For 5 pumps in 14 days: hours per day = 1400 ÷ (5 × 14) = 20 hours.कुल कार्य = 7 × 10 × 20 = 1400 पंप-घंटे। 5 पंपों द्वारा 14 दिनों में: प्रतिदिन घंटे = 1400 ÷ (5 × 14) = 20 घंटे।

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