20
15
25
30
Answer is Right!
Answer is Wrong!
The correct answer is B. 15 km/h.
According to the Indian Railway Board’s General Instructions for Loco Running (GIR), the speed of a train shall not be more than 15 km/h in case of whistle failure in block section. This is to ensure the safety of the train and the people on the track.
The other options are incorrect because they are not in accordance with the GIR. Option A, 20 km/h, is the maximum speed for a train in a non-block section. Option C, 25 km/h, is the maximum speed for a train in a slow speed section. Option D, 30 km/h, is the maximum speed for a train in a medium speed section.
I hope this answers your question. Please let me know if you have any other questions.