Amy and Ashley bike along the same trail. Amy bikes the entire trail at a speed of 20 mph and Ashley bikes it at a speed of 15 mph. Amy finishes biking the entire trail 8 minutes before Ashley. How many miles long is the bike trail?

Answer 1

speed=distance/time
20=d/t
20t=d
t=d/20
and
15t=d
d=15/t
so amy finish
15/t-20/t=8/20
find t then you can get their distance

Answer 2

sorry it should be
15/t-20/t=8/60

Answer 3

d/15 - d/20 = 8/60

4 d - 3 d = 8

d = 8
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then Amy takes (8/20)*60 =24 min
and Ashley takes (8/15)*60 =32min
Indeed difference of 8 min

Answer 4

Collins, please check your answers.