A car runs on four tyres and has one extra tyre. If each tyre lasts for 10,000 km then what is the maximum distance (in km) that the car can travel using the five tyres?

• 10000*5/4= 12500 kms
• 11 years agoHelpfull: Yes(3) No(3)
• let abcde be the 5 tyres
  select 4 of the 5 in 5C4 = 5 ways. All the 5 groups will be used for 2kms each.
  In these 5 groups each will be used 4 times. Each tyre is used for 8kms.
  For every 8kms travelled by tyres max dist is 10km overall.
  for 10kms travelled by tyres max distance would be 10/8*10 = 100/8 = 12.5
  
• 11 years agoHelpfull: Yes(3) No(0)