B and C walk around a circular track. They start at 9 a.m from the same point in the opposite directions. B and C walk at a speed of 5 rounds per hour and 4 rounds per hour respectively. How many times shall they cross each other before 1 p.m  Choices
A) 34	B) 35	C) 36	D) 37	E) 38
Explanation:   Relative speed = (5+4)= 
<gadget id="calculator">(5+4)</gadget>
<output>9</output>
9 rounds per hour   So, they cross each other 9 times in an hour hence, they cross 36 times before 1 p.m   Answer: Option 36
<result>C</result>
B and C walk around a circular track. They start at 9 a.m from the same point in the opposite directions. B and C walk at a speed of 5 rounds per hour and 4 rounds per hour respectively. How many times shall they cross each other before 1 p.m