Let the speed of Anshul be v km/hr. So the speed of Nitish would be 2v km/hr. Time taken by Anshul and Nitish to reach exactly midway between A and B, while returning to their 9 9 starting points =
9
v
hrs and
9
2v
hrs respectively, Anshul started
1
2
hr early. Hence,
9
v
=
9
2v
+
1
2
v=9 km/hr Distance covered by Anshul till 10:30 a.m. =9×12=4.5km Time required by Anshul and Nitish to cover the remaining 6 - 4.5 = 1.5 km for their first meeting =