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Sean and Barry are participating in a 30-mile bike race. Sean averages 20 miles per hour and Barry averages 15 miles per hour. How many miles will Barry be from the fi nish line when Sean fi nishes the race?

Sagot :

Dominiviz
[tex] If\ Sean\ runs\ 20\ mph... \\ He\ will\ reach\ the\ goal\ within\ 1\ hour\ and\ 30\ minutes. \\ \\ If\ Barry\ runs\ 15\ mph... \\ He\ will\ reach\ the\ goal\ within\ 2\ hours. \\ \\ 1\ hour\ and\ 30\ minutes\ subtracted\ to\ 2\ hours=30\ minutes \\ \\ Let\ x\ be\ the\total\ miles\ of\ Barry\ when\ Sean\ reach\ the\ goal \\ Let\ y=15\ miles \\ Let\ z=30\ minutes \\ \\ Formula; \\ \frac{y}{z}=x \\ \\ Therefore, \\ \\ \frac{15\ miles}{30\ minutes}=x \\ \\ \boxed{7.5\ miles=x} [/tex]

Tgf45viz
Let 'S' be the distance from starting point up to the Finish line.
      't' be the time to finished the race.
      'v' be the velocity
      'X' be the distance of Barry from the finish line When Sean finished the race.
Considering Sean:
  v=S/t
  t =S/v
  t = 30/20
  t = 3/2 hr

Considering Berry :
  v =(30-X)/t         
but the time takes of Sean to finish the race is equal to the time of Berry to finish the race.So,
   vt = (30-X)
   (15)(3/2) = (30-X)
    X = 7.5 miles           (ans.)