Time together and the others' times: one worker's time alone

This type of question, asked 14 times: 17 Jul 2023 S1, 19 Jul 2023 S2, 20 Jul 2023 S3, 21 Jul 2023 S1, 24 Jul 2023 S2, 24 Jul 2023 S3, 25 Jul 2023 S1, 25 Jul 2023 S3, 26 Jul 2023 S2, 26 Jul 2023 S4, 26 Sep 2024 S2, 13 Sep 2025 S2, 22 Sep 2025 S1, 26 Sep 2025 S1. All 14 questions below, oldest first.

Try each one first, then open its answer.

Question 1
17 Jul 2023 S1
62 $Rakshit, Ajay, and Satish are sanitation workers in a Municipal Corporation. Rakshit alone takes 20 hours to clean a drain while Ajay takes 12 hours when working alone to do the same. All three together take only 5 hours to clean the drain. In how many hours, can Satish complete the work alone?$
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Question 2
19 Jul 2023 S2
75 $Anil and Bipin together can complete a work in 15 days, while Bipin alone can finish it 20 days. In how many days can Anil alone finish the work?$
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Question 3
20 Jul 2023 S3
56 $A and B working together can finish a piece of work in 8 days while B alone can do it in 24 days. In how many days can A alone finish the work?$
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Question 4
21 Jul 2023 S1
61 $If A and B together can do a piece of work in 20 days, and A alone can do the same work in 30 days, then in how many days can B alone complete the same work?$
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Question 5
24 Jul 2023 S2
71 $P and Q together can complete a piece of work in 6 days. If P can alone complete the work in 18 days, then the number of days required for Q to finish the work is:$
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Question 6
24 Jul 2023 S3
73 $A, B and C together can complete a work in 12 days. A as well as B alone can do the same work in 36 days. In how many days can C alone complete the same work?$
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Question 7
25 Jul 2023 S1
70 $Raju and Rajat working together take 5 days to complete a piece of work. If Raju alone can do this work in 7 days, how long would Rajat take to complete the same work?$
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Question 8
25 Jul 2023 S3
73 $3\frac{1}{2}$
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Question 9
26 Jul 2023 S2
65 $A can complete a piece of work alone in 120 days, while A and B, working together, can complete this piece of work in 72 days. In how many days can B, working alone, complete this piece of work?$
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Question 10
26 Jul 2023 S4
72 $Ramesh alone can complete a work in 24 days. Ramesh and Somesh can complete it in 8 days. How long will Somesh alone take to complete the work?$
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Question 11
26 Sep 2024 S2
59 $Varun and Raju, working together, can complete a job in 40 hours whereas Varun alone can complete the same job in 50 hours. The number of hours required by Raju to complete the job alone is:$
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Question 12
13 Sep 2025 S2
66 $A can lay railway track between two specified stations in 16 days, while B can complete the same task in 12 days. When C assists them, they manage to finish the job in just 4 days. How long would it take for C to complete the job on their own?$
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Question 13
22 Sep 2025 S1
63 $Dhaval and Dhiraj together can do a piece of work in 12 days. Dhaval alone can do it in 20 days. In how many days can Dhiraj alone do it?$
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Question 14
26 Sep 2025 S1
75 $A, B, and C together can complete a task in 6 days. If A alone takes 12 days and B alone takes 18 days, how long will C alone take?$
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Time together and the others' times: one worker's time alone

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Question 14