A student takes 8 minutes to go to his school at a distance of 3km from his house. And takes 12 minutes for the return journey what is his average speed find average velocity

• Ans : Average velocity = 18 Km/hr
  
  student going school with speed of(X) = 3 km/8 min => 45/2 km/hr
  
  returning speed (Y)= 3km/12 min => 15 km/hr
  
  so,Average Speed = 2xy/x+y
  
  => (2*45/2*15) / (45/2+15) = 18km/hr
• 10 years agoHelpfull: Yes(2) No(0)