If a snail climbs a wall 10 cm every hour but slips down 7 cm every hour, how long will it take the snail to climb 457 m
+23251 I am going to assume that the snail is to climb a wall of 457 cm (not m).
The "trick" in this question is to realize that the snail will climb the last 10 cm without slipping back down 7 cm.
So, the snail will climb 347 cm at the rate of 3 cm per hour: 347 / 3 = 149 hours
and, then, 1 more hour to get to the top: 150 hours.
