Mathematics · Time and Work
A and B can together complete a task in 20 hours. After 5 hours, A leaves, and then B takes 45 hours to finish the remaining task. How many hours would A have taken to complete the entire task if he worked alone from the beginning?
- 160 hours
- 248 hours
- 340 hours
- 430 hours✓
Correct answer
30 hours
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