Top 20 MCQs on work rates, Pipes & Cisterns, efficiency problems. Select an option to instantly see the answer!
A can do a work in 10 days and B can do it in 15 days. In how many days will they complete it together?
A pipe can fill a tank in 6 hours and another can empty it in 8 hours. If both are open, in how many hours will the tank be filled?
A and B together can finish a job in 12 days. A alone takes 20 days. How long does B alone take?
If 6 men can do a work in 10 days, how many men are needed to finish the same work in 4 days?
A works twice as fast as B. If B can complete a job in 30 days, in how many days can they complete it together?
Two pipes A and B can fill a tank in 20 min and 30 min. Pipe C empties it in 15 min. If all three are open, when will the tank be full?
A can complete a work in 24 days. He works for 6 days and then B finishes the rest in 18 days. How many days would B alone take?
12 workers can complete a task in 8 days. How many workers are needed to finish it in 6 days?
A tank has a leak that can empty it in 8 hours. A pipe fills it in 6 hours. If both operate, how long to fill the tank?
A and B can do a work in 18 and 24 days respectively. They work together for 6 days, then A leaves. How many more days does B take?
A cistern has 3 inlet pipes and 2 outlet pipes. Each inlet can fill it in 6 hours; each outlet can empty it in 12 hours. How long to fill?
20 men can finish a work in 30 days. After 18 days, 10 men left. In how many more days will the rest finish?
A can do a piece of work in 14 days and B can do 40% more work in the same time. How long will B alone take?
Pipe A fills a tank in 15 mins, Pipe B in 20 mins. Both are opened. After 4 mins, Pipe B is closed. How long does A take to fill the rest?
A, B, and C can do a job in 6, 8, and 12 days. They all start together, but C leaves after 2 days. How long does it take to finish?
If 5 men or 8 women can do a work in 12 days, how many days will 2 men and 3 women take?
A tap can fill a bucket in 12 minutes and drain it in 18 minutes. If both are open, how long to fill 3/4 of the bucket?
X can complete a work in 20 days working 8 hours/day. Y can do it in 16 days working 10 hours/day. In how many days can both finish it working 8 hours/day?
A and B can do a job in 10 days working together. A is 50% more efficient than B. In how many days can A alone finish the job?
4 men and 6 boys can do a work in 8 days; 3 men and 7 boys can do it in 10 days. In how many days can 10 boys do it?
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