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A man rides at the rate of 18 km/ hr, but stops for 6 mins. to change horses at the end of every 7th km. The time that he will take to cover a distance of 90 km is
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- 6 hrs.
- 6 hrs. 12 min.
- 6 hrs. 18 min.
- 6 hrs. 24 min.
Correct Option: B
90 km = 12 × 7km + 6 km. To
| cover 7 km total time taken = | |
| 8 |
| hours + 6 min. = | min. So, | |
| 3 |
(12 × 7 km) would be covered in
 | 12 × |  | min. and remaining 6 km is | hrs or 20 min | ||
| 3 | 18 |
| ∴ Total time = | + 20 | |
| 3 |
| = | hours = 6 | hours | ||
| 3 × 60 | 5 |
= 6 hours 12 minutes.
