MindMaze Algorithm Developer interview questions

After sending my CV, I got an email in a couple of days, asking me to do an assignment. The assignment was not difficult, it could be done in 3 hours. The task was that I got a dataset consisting of unlabelled IMU sensor data, and I had to figure out where these sensors were placed on the human body, and what activity the user was performing. Even though I felt that the task was not difficult, I did not get selected. I got a reply 2 months(!) later that they chose another candidate.