RIDDLE 28: HENRY'S CASE

Henry, a man who is 40 years old, died at 7 p.m. in front of a shopping centre in London. From the witnesses of people and the cameras installed in the area, the detective finds out that, at the same time, 4 people passed by:

- Laura, who lives at 6000 m from the shopping centre and has an average speed of 150 m/min to arrive at the shopping centre;

- Marco, who has an average speed of 40 m/min and lives at 2000 m from the shopping centre;

- Luca, who lives at 2000 m from Marco’s house and takes 50 min to arrive at the shopping centre;

- Giovanni, who has an average speed of 150 m/min and who stopped to talk with a friend for 25 min.

Who was Henry killed by?