A works x days, B finishes the rest in y days: B's time alone or time together

This type of question, asked 3 times: 18 Jul 2023 S2, 25 Jul 2023 S2, 15 Sep 2025 S3. All 3 questions below, oldest first.

Try each one first, then open its answer.

Question 1
18 Jul 2023 S2
70 $Raja and Rocky together can complete painting work in 5 days. Together they both start painting, but after 2 days, Rocky falls sick and leaves the work. If Raja completes the remaining painting in 4 days, find the number of days in which Rocky alone can do the work.$
Tap an option to check your answer.
Question 2
25 Jul 2023 S2
56 $A can finish a work in 60 days. He works at it for 15 days and then B alone finishes the remaining work in 48 days. In how much time can A and B working together finish the work?$
Tap an option to check your answer.
Question 3
15 Sep 2025 S3
66 $A and B can complete a certain task together in 30 days. After A works for 16 days, B is left to finish the remaining work by himself in 44 days. How many days would it take for B to complete the entire task on his own?$
Tap an option to check your answer.

Question 1