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P, Q, R and S are working on a project. Q can finish the task in 25 days, working alone for 12 hours a day. R can finish the task in 50 days, working alone for 12 hours per day. Q worked 12 hours a day but took sick leave in the beginning for two days, R worked 18 hours a day on all days. What is the ratio of work done by Q and R after 7 days from the start of the project?
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- 10:11
- 11: 10
- 20: 21
- 21: 20
Correct Option: C
Q can finish the task = 25 days, 12 hrs/day = 300 hrs
| ⇒ 1 hr = | th | |
| 300 |
R can finish the task = 50 days, 12 hrs/day
= 50 × 12 = 600 hrs
| ⇒ 1 hr = | th | |
| 600 |
Q working hours ⇒ (7 - 2) × 12 = 60hrs
R working hours 7 × 12 = 60hrs
After 7 days, the ratio of work done by Q and R
