Work efficiency and pipes-cisterns.
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Q1 · Time and Work · EASY
A can complete a work in 12 days and B can complete the same work in 18 days. If they work together, in how many days will they complete the work?
Q2 · Time and Work · EASY
15 men can complete a piece of work in 20 days. How many days will 25 men take to complete the same work?
Q3 · Time and Work · MEDIUM
A pipe can fill a tank in 6 hours. Due to a leak at the bottom, it takes 9 hours to fill the tank. If the tank is full, in how many hours will the leak empty it?
Q4 · Time and Work · MEDIUM
A and B can do a piece of work in 12 days, B and C in 15 days, and C and A in 20 days. How many days will A alone take to complete the work?
Q5 · Time and Work · HARD
A and B together can complete a work in 8 days. A starts the work and works for 6 days, then B alone completes the remaining work in 12 days. In how many days can A alone complete the entire work?