- A25.2
- B62.5
- C27
- D125
Step-by-Step Solution
Combined rate = 1/35 + 1/90 = (18 + 7)/630 = 25/630 field per hour, so time = 630/25 = 25.2 hours.
Answer: A) 25.2
Two diesel pumps drain water into a paddy field in Thanjavur; pump X alone needs 35 hours and pump Y alone 90 hours to flood it fully. How many hours do they need together?
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