A frog can climb up a well at 3 ft per min but due to slipperiness of the well, frog slips down 2 ft before it starts climbing the next minute. If the depth of the well is 57 ft, how much time will the frog take to reach the top?
Options.
A) 29
B) 27
C) 55
D) 17
E) 10
Explanation:   As per given, in 1 min,frog climbs up 3 ft and slips down by 2 ft.   So the frog climbs only 1 ft in 1 min   So after 54 mins,it would have climbed 54ft.   At the end of 55 mins it climbs up 3 ft to make it 57 ft and come out of the well.   Once it had reached the destination,it will not slip.   So the frog will take only 55 minutes to climb up the well.   Answer: 55
<result>C</result>
A frog can climb up a well at 3 ft per min but due to slipperiness of the well, frog slips down 2 ft before it starts climbing the next minute. If the depth of the well is 57 ft, how much time will the frog take to reach the top?