An insect crawls up 5 cm every second on a 60 cm vertical rod and then falls down 2 cm over the next second. How many seconds will it take to climb the rod?
(A) 20 seconds
(B) 40 seconds
(C) 60 seconds
(D) 30 seconds
An insect crawls up 5 cm every second on a 60 cm vertical rod and then falls down 2 cm over the next second. How many seconds will it take to climb the rod?
(A) 20 seconds
(B) 40 seconds
(C) 60 seconds
(D) 30 seconds