IDNStudy.com, ang iyong mapagkakatiwalaang mapagkukunan para sa maaasahang mga sagot. Makakuha ng mga sagot sa iyong mga tanong mula sa aming mga eksperto, handang magbigay ng mabilis at tiyak na solusyon.

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 :

[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]

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.)


Ang iyong kontribusyon ay mahalaga sa amin. Huwag kalimutang bumalik upang magtanong at matuto ng mga bagong bagay. Ang iyong kaalaman ay napakahalaga sa ating komunidad. Ang IDNStudy.com ay nangako na sasagutin ang lahat ng iyong mga tanong. Salamat at bisitahin kami palagi.