arithmetic - a and b walk around a circular track they start at 8 am from the same point in the opposite directions a and b walk at a speed of 2 rounds per hour and 3 rounds per hour respectively how many times shall they cross each other before 930 - skillgun

Relative speed = (2 + 3) = 5 rounds per hour.
So, they cross each other 5 times in an hour and 2 times in half an hour.
Hence, they cross each other 7 times before 9.30 a.m.