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 9.30 a.m.?
Choose the correct choice from the following options: A) 9.39 am B) 9.80 am C) 9.30 am D) 9.32 am E) 5.30 am
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 and 2 times in 1/2 hour   Time duration from 8 am to 9.30 am = 1.5 hour   Hence they cross each other 7 times before 9.30 am   Answer : 9.30 am
<result>C</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 9.30 a.m.?