A and B are traveling in the same duration. B is traveling at a constant speed of 55kmph and the distance between A and B is 1.5 km. If A crosses B within 1 minute, what is the speed of A?

• let the speed of A is x kmph
  A and B are travelling in same direction so their relative speed is subtraction of two speeds
  we know that,
  time=distance/relative speed
  1/60=1.5/x-55
  By solving above equation we get x as 145kmph
• 5 years agoHelpfull: Yes(3) No(0)
• let x be the speed of B
  since, meeting time = total distance/relative speed
  meeting time = 1/60 (convert min into hrs)
  distance= 1.5km (given)
  relative speed= x-55 (both are moving in the same direction)
  therefore, 1/60 = 1.5/x-55
  on solving the above equation we get x=145 i.e. speed of B 145kmph
• 5 years agoHelpfull: Yes(3) No(0)
• x-55 = (1.5/(1/60))
  x=64kmph
• 5 years agoHelpfull: Yes(2) No(4)
• b's speed=distance/time;
  =1.5*60=90km/h.
  90+55=145.
• 5 years agoHelpfull: Yes(2) No(1)
• B's speed=55km/hr.
  Since A is crossing B Both are travelling in the same direction.
  The distance between the is A----------1.5km------------B.
  In 1 minute B will travel 11/12km.
  Remaining 1-11/12km is travelled by A i.e., 7/12km
  7/12km =1minute
  7/12km=1/60hr
  35km=1hr
  i.e answer is 35km/hr
  isn't it????
• 5 years agoHelpfull: Yes(0) No(3)