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his office 20 minutes late. Then his usual time for walking to his office is :Walking at 3 of his usual speed, a man reaches 4
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- 1 hour
- 30 minutes
- 45 minutes
- 40 minutes
Correct Option: A
Usual time = x minutes
| New time = | minutes | |
| 3 |
 | ∵ Speed ∝ |  | |
| Time |
According to the question,
| − x = 20 | |
| 3 |
| ⇒ | = 20 | |
| 3 |
⇒ x = 60 minutes i.e. 1 hour.
