The monkey climbs 12 metres in 1 minute and then he slips back 3 metres in the next minute ∴ The monkey climbs in the first 2 minutes = 12 – 3 = 9 metres ∴ In the first 12 minutes the monkey climbs = 9 × 6 = 54 metres Remaining height of the pole to be covered by the monkey = 63 – 54 = 9 metre ∴ The monkey will climb the height of 9 metres in the 13th minute ∴ The monkey climbs 12 metres in 1 minute ∴ The monkey will climb 9 metres in
1
12
×9 =
3
4
minute ∴ Time spent in climbing at the top of the pole = (12+