A man on tour travels first 160 km at 64 km/hr and the next 160 km at 80 km/hr. The average speed for the first 320 km of the tour is:
35.55 km/hr
36 km/hr
71.11 km/hr
71 km/hr

• 71.11 kms/hr
  
  In cases were two equal distances are covered with 2 average speeds say S and s, then
  average speed of complete tour = 2*S*s/(S+s)
  
  so here , average speed = 2*64*80/144 = 640/9 = 71.11 km/hr
• 12 years agoHelpfull: Yes(11) No(1)