Answer: 4500 seconds
Explanation:
Given : A snail travels 80 feet in 50 minutes.
Formula for speed =

Speed of snail =
feet per minute. (1)
Let x be the time taken by snail to travel 120 feet, then speed of snail will be :
(2)
If rate is same, then we have from (1) and (2)
In seconds,

Hence, the snail will take 4500 seconds to travel 120 feet.