Jeffery lives 5km from his office and works out at a gym that is located another 7.5 km past his office. He rides a bike between all locations.

On Monday he realised once he had got to work that he left his shoes at home. During his lunch break he rode home to get his shoes, returned to the office and then after work he went to the gym. He then rode home.

If he rides his bike at an average speed of 15km per hour,