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A man travels a distance of 24 km at 6 kmph. Another distance of 24 km at 8 kmph and a third distance of 24 km at 12 kmph. His average speed for the whole journey (in kmph) is
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8 2 3 - 8
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2 10 13 - 9
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Correct Option: B
Total distance
= 24 + 24 + 24 = 72 km.
| Total time = |  | + | + |  | hours | |||
| 6 | 8 | 12 |
= (4 + 3 + 2) hours = 9 hours
| ∴ Required average speed = | |
| Total time |
| = | = 8 kmph. | |
| 9 |
