Meesho SDE - 3 iOS interview questions

So as someone mentioned for other iOS interviews, the interviewer was late and I was 10 mins early, I completed the task/app, and the only thing which was left behind was caching the image not that I didn't know how to but it's just that the image cacher cannot be implemented in last 1 minute, the total time limit was 90 mins, even with the help of google people take around 60 hour - 90 mins, but on the another I did that in 90 mins, the app was running, code was Unit testable, all the news article along with images were correctly displayed and yet they rejected for some unknown reasons.