If you get the speed of the rock then you can use
Time= distance/ speed
So all you need is the speed and you can work it out
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No, you're fat if you weight 8 stone at only 13. I'm 13 today and I weight 7 stone, so does my identical twin brother.
12 stone is already too heavy for a 13 year old. Do not put on more weight.
About 13 years at 5.5%
Roughly 13 minutes.
3 1/13 hours.