2. A man travels from A to B at 4 mph over a certain journey and returns over the same route to A, at 5 mph. What is his average speed for the journey?
a) 4.44 mph b) 4.8 mph c) 4.887 mph d)5 mph

• Ans 4.44 mph
  
  Average speed = 2*x*y/(x+y)
  = 2*4*5/9
  = 4.44 mph
• 13 years agoHelpfull: Yes(10) No(1)
• average speed is simply given by formula
  2ab/a+b
  so solution is
  2*4*5/(4+5)= 40/9
• 13 years agoHelpfull: Yes(4) No(0)
• average speed=total dist/total time
  total dist=2x
  total time =(x/4)+(x/5)
  hence ans is 4.44mph
• 13 years agoHelpfull: Yes(4) No(0)