Uber Machine Learning Engineer interview questions

I got the Online assessment and need to finish within 75 minutes. There are four questions, 2 easy and 2 medium/hard. I didnot finish well and got rejected at the end. the 4th question is with the highest score, and the 1st the lowest score, arrange your time properly

Applied online. HR contacted with basic screening questions related to visa, location and availability. The recruiter then scheduled a coding round video interview with a senior engineer via code signal.