C and D walk around a circular track. They start at 11 a.m from the same point in the opposite directions. C and D walk at a speed of 7 rounds per hour and 8 rounds per hour respectively. How many times shall they cross each other before 5 p.m Select:
A) 90 B) 95 C) 100 D) 105 E) 110
Explanation:   Relative speed = (7+8)= 
<gadget id="calculator">(7+8)</gadget>
<output>15</output>
15 rounds per hour   So, they cross each other 15 times in an hour hence, they cross 90 times before 5 p.m   90nswer: Option 90
<result>A</result>
C and D walk around a circular track. They start at 11 a.m from the same point in the opposite directions. C and D walk at a speed of 7 rounds per hour and 8 rounds per hour respectively. How many times shall they cross each other before 5 p.m