Correct option is A
Given
Length of train = 290 m
Length of platform = 3 × 290 = 870 m
Time taken = 29 seconds
Formula Used
Speed = Total Distance / Time
Conversion to km/hr = Speed in m/s × 18/5
Solution
Total distance covered = 290 + 870 = 1160 m
Speed in m/s =
Convert speed into km/hr:
Speed =
Speed = km/hr
Final Answer
So the correct answer is (a)