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A man can do a piece of work in 30 hours. If he works with his son then the same piece of work is finished in 20 hours. If the son works alone he can do the work in
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- 60 hours
- 50 hours
- 25 hours
- 10 hours
Correct Option: A
Let time taken by son be x hours.
∴ Father’s and son’s 1 day’s work
| = | + | |||
| 30 | x |
| ∴ | + | = | ||||
| 30 | x | 20 |
| ⇒ | = | - | ||||
| x | 20 | 30 |
| = | = | |||
| 60 | 60 |
∴ x = 60 hours
