X and Y walk around a circular track. They start at 10 a.m from the same point in the opposite directions. X and Y walk at a speed of 6 rounds per hour and 7 rounds per hour respectively. How many times shall they cross each other before 3 p.m	Choose the correct choice from the following answers.
A) 64  B) 65  C) 66  D) 67  E) 68
Explanation:   Relative speed = (6+7)= 
<gadget id="calculator">(6+7)</gadget>
<output>13</output>
13 rounds per hour   So, they cross each other 13 times in an hour hence, they cross 65 times before 3 p.m   Answer: Option 65
<result>B</result>
X and Y walk around a circular track. They start at 10 a.m from the same point in the opposite directions. X and Y walk at a speed of 6 rounds per hour and 7 rounds per hour respectively. How many times shall they cross each other before 3 p.m