Let the total time taken by the monkey to reach the top of the pole be t minutes.

The total distance covered by the monkey in t minutes can be expressed as:
Distance covered = (3×t) - (1×(t-1))
= 3t - t + 1
= 2t + 1

Since the monkey has to cover a total distance of 30 metres to reach the top of the pole,

2t + 1 = 30
⇒ t = 29.5

Therefore, the monkey will take 28 2/3 minutes to reach the top of the pole.

Hence, Option B is the correct answer.

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