A and B walk around a circular track. A and B walk at a speed of 2 rounds per hour and 3 rounds per hour respectively. If they start at 8 a.m. from the same point in opposite directions, how many times shall they cross each other before 10 a.m.? Pick one:
A) 5
B) 6
C) 7
D) 8
E) 10
Relative speed = Speed of A + Speed of B (? they walk in opposite directions)   = 2 + 3= 
<gadget id="calculator">2 + 3</gadget>
<output>5</output>
5 rounds per hour=&gt; They cross each other 5 times in 1 hour   Time duration from 8 am to 10 am = 2 hour   Hence they cross each other 10 times before 10 am   Answer is 10
<result>E</result>
A and B walk around a circular track. A and B walk at a speed of 2 rounds per hour and 3 rounds per hour respectively. If they start at 8 a.m. from the same point in opposite directions, how many times shall they cross each other before 10 a.m.?