Answer :
Basically we are finding the least common multiple of 40 & 25:
25 : 1,25,50,75,100,125,150,175,200
40: 1,40,80,120,160,200
They will meet again after 200 minutes.
[tex]x = \frac{200}{60} = 3 + \frac{20}{60} [/tex]
So they will meet again after 3 hours and 20 minutes;
9:30 + 3:20 = 12:50 p.m.
That's your answer