Question 3
A baby wants to take the milk bottle on the 8th stair. Each stair takes him 1 second to climb up and 1 second to climb down. He climbs up 3 stairs and down 1 stair, repeating until he gets the milk bottle. How long does it take in total?
Picture labels: GO means start; FINISH means the end.
Picture labels: GO means start; FINISH means the end.