Time & Work / Pipes — practice questions, page 12
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Question10 workers build a 120 m wall in 12 days working 8 hours a day. How many hours a day must 15…Question25 men were to finish a job in 30 days. After 20 days only half was done. How many extra men are…QuestionA works 6 hours a day and finishes a job in 16 days; B works 8 hours a day and finishes it in 10…Question3 men do as much as 4 women, and 2 women as much as 3 boys. 4 men finish a job in 18 days. How…QuestionA takes 8 days and B 12 days for a job. They work on alternate days, A first. How many days does…QuestionA can do a job in 30 days and B in 20. They work together for 6 days, then B leaves. A works 6…Question30 men were to finish a job in 40 days. After 25 days, 10 more men join. How many days early is…QuestionNikhil and Om together can lay a footpath in 24 days. They work together for 16 days, then Om…QuestionA and B can do a job in 20 days. A works 10 days alone and then B finishes it in 30 days. How long…QuestionA can do a job in 9 days and B in 12 days. They work on alternate days, A first. How many days…QuestionA can do 40% of a job in 8 days and B 25% of it in 10 days. Each works 5 days, one after the…QuestionA, B and C can do a job in 10, 15 and 30 days. On day 1 A works alone, on day 2 A and B, on day 3…QuestionA and B can do a job in 72 days, B and C in 120 days, A and C in 90 days. How long would A take…Question3 men or 5 women can do a job in 20 days. A team of 3 men and 5 women does it for Rs 8,000. How…QuestionPallavi can finish a sewing order in 12 days and Rohini in 18 days. They begin together, but…QuestionPipes A (6 hours) and B (4 hours) are opened alternately for 1 hour each, A first. How long does…QuestionPipes A (12 min) and B (15 min) are opened alternately for 1 minute each, B first. How long does…QuestionAn inlet fills a tank in 20 hours and an outlet empties it in 30 hours. They are opened…QuestionA fills a tank in 10 hours, B in 12 hours, and C empties it in 20 hours. A is opened at 9 a.m.; B…QuestionTaps P and Q together fill a cistern in 20 minutes. Tap P alone would need 28 minutes. How long…QuestionTwo pipes have diameters 2 cm and 3 cm, with water flowing at the same speed. The larger fills a…QuestionA and B together finish a job in 10 days. If A's efficiency were doubled and B's halved, they…Question10 men, or 20 women, or 40 children can do a job in 20 days. How long will 5 men, 5 women and 5…QuestionA job needs 1,500 worker-hours. On day 1, 10 workers work 8 hours; each later day 2 more workers…QuestionA contractor employs 15 men to finish a job in 30 days. After 24 days he adds 6 men and finishes 1…
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