If a car travels a distance of 300 km in 8 hours, partly at a speed of 40 kmh-1 and partly at 30 kmh-1, what is the distance it travelled at the speed of 40 kmh-1?
1) 200 km
2) 210 km
3) 220 km
4) 240 km

• let the distance travelled at 40 kmph=x km
  distance travelled at 30 kmph =300-x km
  x/40 + (300-x)/30 = 8
  x = 240
• 8 years agoHelpfull: Yes(7) No(0)
• Let the distance travelled at 40 kmh-1 = x km
  ? distance travelled at 30 kmh-1 = 300 - x
  
  300/8 = 300/(x/40) + (300-x)/30
  x = 240
• 8 years agoHelpfull: Yes(2) No(0)