Question 375190
Jan can run 7.5 meters per second, Mary at 8.0 meters per second. On a race track Jan is given a 25 meter head start, the race ends in a tie. How long is the track?
Jan 7.5 m/s
Mary 8m/s
..
let the track distance = x
Jan gets 25 m head start
..
Time taken is the same
..
time = d/r
(x-25)/7.5 = x/8
(x-25)*8=7.5x
8x-200=7.5x
8x-7.5x=200
0.5x=200
x=200/0.5
x=400 meters the track length
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m.ananth@hotmail.ca