A monkey climbs a 40m high pole. In the first minute, he climbs 3m and slips down 1m in the next minute. How much time is required by it to reach the top?

Question: A monkey climbs a 40m high pole. In the first minute, he climbs 3m and slips down 1m in the next minute. How much time is required by it to reach the top?

Solution:
in two minutes,
total distance covered by the monkey is = 3 - 1 = 2m
in 1 minute = 2/2 = 1m

in 36 minutes it will cover = 36m
in the 37th minute, it will go up to = 36 +3 = 39m
in the 38th minute, it will fall 1m ad thus covers = 39 - 1 = 38m

the rest of the 2m of total 40m will be climbed in 1 minute.
thus total time to reach the peak is = 38 + 1 = 39 minutes.