A. 9 a.m.
B. 9.30 a.m.
C. 10 a.m.
D. 10.30 a.m.
Suppose they meet x hours after 7 a.m
Distance covered by A in x hours = 20x km
Distance covered by B in (x - 1) hours = 25(x - 1) km
=> 20x + 25(x - 1) = 110
=> 45x = 135
=> x = 3
So, they meet at 10 a.m