If the paintball is going 150m a second and the question asks, "starting from the distance of your friend what is the distance every TENTH of a second" Ok so 150 meter a second so to get a tenth of a second you do 150/10 which is 15, if you start at 25 m away from you then only A and E could be correct, so now do 25+15 then that +15 and so on and you can see that letter choice E is correct
