a monkey climbs 30m at the beginning of each hour and fall back 20m during each hourly period . if he begins his ascend at 8:00am at what time will he first make contact with the point 70m distant from the ground?
a.11am
b.12nn
c.1pm
At 9 he was at 10 m
10 -- 20 m
11 -- 30 m
12 -- 40 m
1 -- 70 m
When he reached 70 m, he didn't have a chance to fall back again.