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If x can finish a job in 4 hours and y can finish the same job in 8 hours independently, then they together will finish the job in
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- 140 minutes
- 160 minutes
- 120 minutes
- 150 minutes
Correct Option: B
| (x and y)’s 1 hour work = | + | 4 | 8 |
| (x and y)’s 1 hour work = | = | 8 | 8 |
| ∴ Required time = | hours | |
| 3 |
| Required time = |  | × 60 |  | minutes = 160 minutes | 3 |
Second method to solve this question ,
Here , x = 4 , y = 8
| Time taken = | hours | |
| x + y |
| Time taken = | = 160 minutes | |
| 4 + 8 |
