Correct Answer: Option B
Solution:
Let the trains meet x hours after 7 a.m.
Distance covered by each train:
Train A travels for x hours at 20 kmph
Train B travels for (x - 1) hours at 25 kmph (since it starts 1 hour later)
Setting up the equation: Since they meet, the sum of distances covered = Total distance
20x + 25(x - 1) = 110
20x + 25x - 25 = 110
45x - 25 = 110
45x = 135
x = 3
Answer: They meet 3 hours after 7 a.m. = 10 a.m.
Verification:
Therefore, the answer is B) 10 a.m.
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