From (1) we get that train leaving from station A takes 2 hours to reach station B.
But We are not given the speed of the trains leaving station B.
Therefore Time taken for Train to reach from station A to B = ? . Not SUfficient
From (2) it's Exactly the opposite of Option (1). Hence Not Sufficient
Combining (1) and(2) we get the Time taken by train to travel from each side and hence no of Oncoming trains can be calculated. Sufficient
P.S: Since this is a DS question we don't have to get the exact number
Hope This Helps
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