A and B walk a circulat track. They start at 8 a.m from the same point in the opposite directions. A and B walk at a speed 0f 2 rounds per hour and 3 rounds per hour respectively. How many times shall they cross each other before 9.30 a.m?
A. 5 B. 7
C. 9 D. 11

• Ans: B.
  Sol.
  Relative speed = (2 + 3) = 5 rounds per hour.
  So, they cross each other 5 times in an hour and 2 times in half an hour.
  Hence, they cross each other 7 times before 9.30 a.m.
• 12 years agoHelpfull: Yes(12) No(2)
• it is c
  why means for every half and hour they cross atleast 3 times
• 9 years agoHelpfull: Yes(0) No(1)