a square is of side 1 km.a man travels first 2 sides with 30mph and third side with 60kmph.what is the speed that man has to travel the fourth side if average speed is 60kmph?

• 120 kmph.
  
  The square is of side 1 km.
  total distance to be travelled = 4 kms.
  average speed reqd = 60 kmph.= 1 km per min
  Time to be taken = 4 mins.
  
  But already 3.5 mins has been spent while travelling first 2 sides with 30mph or 48 kmph or 0.8 km per min in 2.5 mins and third side with 60kmph in 1 min.
  
  so last side of 1 km should be covered in 0.5 mins for overall average speed of 60 kmph .
  so speed for last side will be 1/0.5 = 2 km per min or 120 kmph.
• 12 years agoHelpfull: Yes(2) No(0)
• so simple
  30+30+60+x/4=120
  x=120kmph
  so fourth side spd is 120kmph.
• 10 years agoHelpfull: Yes(1) No(0)
• Based on the question form the equation as...
  (30+30+60+X) / 4 = 60
  120+X = 60*4
  120+ X = 240 => X = 240-120
  Therefore,, X = 120
• 4 years agoHelpfull: Yes(0) No(0)