5
10
15
20
Answer is Right!
Answer is Wrong!
The correct answer is B. 10.
The booked speed of a train is the speed at which it is allowed to travel under normal conditions. The maximum permissible speed is the highest speed at which the train can travel under ideal conditions. The booked speed is always less than the maximum permissible speed to allow for safety margins.
Option A is incorrect because 5% is not a significant difference between the booked speed and the maximum permissible speed. Option C is incorrect because 15% is a larger difference than is typically allowed between the booked speed and the maximum permissible speed. Option D is incorrect because 20% is a very large difference between the booked speed and the maximum permissible speed.