Mathematics · Time and Work
In a computer game, a builder can build a wall in 20 hours while a destroyer can completely demolish such a wall in 40 hours. Initially, both the builder and the destroyer were set to work together. After 30 hours, the destroyer was withdrawn. What was the total time taken to build the wall?
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 133 hours 30 minutes
- 235 hours✓
- 335 hours 15 minutes
- 432 hours 45 minutes
Correct answer
35 hours
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