Question

a student daily leaves school and sits immediately in d car which daily come to school at dat exact time and drive towards his house.bt 1 day he got off from school 1 hour before and as car driver was not knowing about dis,was to arrive from house to school at routine time.so widout waiting he started walking towards his house.on d way he met hi car coming, got into it and drive towards his house.the day he reached 20 minutes earlier.find ratio of his uniform speed of walking to uniform speed of his car.