two people A and B enter a race in which one can run to a point and return back.person A runs at 20 mph to and from the point. person B runs to the point at 10mph and at a 30mph while going back.who came first?

• A will come first
  avg speed of A is 20
  avg Speed of B is 15
  so A will come first
  
• 11 years agoHelpfull: Yes(16) No(2)
• A will come first.
  By the time , B reaches other end, A has already reached the starting point after completing race as his speed is double than B.
• 11 years agoHelpfull: Yes(8) No(0)
• for A it will be = (2*20*20)/(20+20)=20
  and for B it will be=(2*10*30)/(10+30)=15
  so A will come first.
• 11 years agoHelpfull: Yes(5) No(0)
• A comes first
• 11 years agoHelpfull: Yes(1) No(2)