Question

problema 5 cu biciclistu

Answer 1

   I zi⇒1/5*x+10
  II zi⇒[x-(1/5*x+10)]*3/10⇒(3/10)*x-(3/50)*x-3⇒12/50*x-3⇒(6/25)*x-3
 III zi⇒{x-[(1/5*x+10)]*3/10}*2/3+12⇒[(x-1/5x-10)*3/10]*2/3+12⇒
x*3/10*2/3-1/5x*3/10*2/3-10*3/10*2/3+12⇒1/5x-1/25x-2+12⇒4/25x+10
IV zi⇒83
x=(1/5)x+10+(6/25)*x-3+(4/25)*x+10+83
x=(5+6+4)/25*x+100
x=15/25x+100
(25-15)*x=2500
x=250km.