What is the maximum speed in block section during thick & foggy weather? A. 30 kmph B. 60 kmph C. 15 kmph D. Not to move

The correct answer is C. 15 kmph.

During thick and foggy weather, the visibility is reduced and it is difficult to see the track ahead. This makes it dangerous to travel at high speeds, as there is a risk of colliding with another train or object. To reduce the risk of accidents, the maximum speed in block sections during thick and foggy weather is 15 kmph.

Option A is incorrect because it is too high a speed for the conditions. Option B is incorrect because it is not a safe speed. Option D is correct, but it is not a complete answer. The correct answer is C. 15 kmph.