This is a pipes and cisterns problem. The rates of filling and emptying are usually expressed as the fraction of the tank filled or emptied per unit of time (e.g., per hour). When a leak is present during filling, the effective filling rate is the tap rate minus the leak rate.
A tank is filled by a tap in 15 hours. Due to some leakage at the bottom, 5 more hours are required to fill the tank. Then if the tank is full, in how many hours will it be empty due to leakage ?
Asked in GPSC Prelims CSP 1 2017 · Topic: Industrial Sector (Performance and Trends of Industrial Growth (Contribution to GDP, Employment, Index of Industrial Production))
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