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reaches school 20 minutes earlier. Find his usual time.By walking 5 of usual speed a student 3
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- 45 minutes
- 50 minutes
- 60 minutes
- None of these
Correct Option: B
5/3 of usual speed means 3/5 of usual time as he reaches earlier.
| ∴ | usual time + 20 minutes = Usual time | |
| 5 |
| 20 minutes = |  | 1 − |  | usual time | |
| 5 |
| = | usual time | |
| 5 |
| ∴ Usual time = | = 50 minutes. | |
| 2 |
