length of trail ---- x miles
x/15 - x/20 = 8/60
times 60 , the LCD
4x - 3x = 8
x = 8
the trail is 8 miles long
check:
time at 20 mph = 8/20 hrs = 24 minutes
time at 15 mph = 8/15 hrs = 32 minutes
for a difference of 8 minutes
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?
1 answer
4 answers