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Q1. Two persons X and Y can dig a pit in 16 hours together. They worked together 4 hours and then a third person Z whose efficiency is half of their together’s efficiency joins them. Find in how much time the whole work will be completed?
(a) 10 hrs.
(b) 13 hrs.
(c) 12 hrs.
(d) 16 hrs.
(e) 18 hrs.
Q2. A can complete 1/4 of a work in 10 days, B can complete 40% of the work in 15 days, C completes 1/3 of the work in 13 days and D completes 1/6 of work in 7 days. Who will be able to complete work fastest?
(a) A
(b) B
(c) C
(d) D
(e) Can’t be determined
Q3. A pump can fill a tank with water in 2 hours. Because of a leak in the tank it was taking to fill the tank. The leak can drain all the water off the tank in:
Q4. A is 30% more efficient than B. How much time will they take, working together, to complete a job which A alone could have done in 23 days ?
Q5. 12 men complete a work in 18 days. Six days after they had started working, 4 men joined them. How many days will all of them take to complete the remaining work ?
(a) 10 days
(b) 12 days
(c) 15 days
(d) 9 days
(e) 8 days
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