Question I have on calculating ages.(bad title)

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Bad title but I just can think of a better way of describing it. Well anyway heres my question and answer, I would really like someone to verify that its correct thanks in advance. Q If the age of the Earth is represented on a time line as 1 calendar year (365 days), how long would the duration of Homo sapiens represent on this time scale. Express your answer to the nearest minute. Ans: age of Earth=4.6*10^9yr age of homo sapiens=5*10^4yr //get length of day in terms of age of earth 4.6*10^9yr / 365day = 1.260...10^7 //calc how many "days" humans have been on planet 5*10^4yr / 1.260...10^7yr =3.967...10^-3 //convert to minutes 3.967...10^-3*24*60=5.714...mins=6 mins(1 sig.fig.) I feel like I got this question completely right but I only get 2 marks for it it just seems that its way too hard for that much work. Anyway any help much aprreciated, looking at that seems pretty hard to follow not even sure myself what I'm doing lol. Cheers

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