Josh lived in a very big house. The distance between his room and his parents room was 100 meters. Halfway between his and his parents room was the restroom.
One day, Josh's mother told Josh to come to his parents room while he was in his room. So Josh started walking towards his parents room. He walked the first 50 meters in 120 seconds. Then he came to the restroom and felt like going inside. So, he went into the restroom and stayed stationary for 60 seconds. After finishing that, he continued his walk to his parent's room at a much faster pace than before. He walked the last 50 meters in 90 seconds at a constant steady pace.