Respuesta :

mhanifa

Answer:

30 km/h

Step-by-step explanation:

usual speed= x km/h

increased speed= x +10 km/h

distance= 360 km

time difference= 3 h

  • 360/x= 360/(x+10) +3
  • 360/x= (360+ 3x+30)/(x+10)
  • 360(x+10)= x(390+3x)
  • 360x+3600= 390x+ 3x²
  • 3x² + 30 x -3600=0
  • x²+10x-1200=0
  • x=30 km/h

Otras preguntas