The correct answer is A. 1 in 360.
Cant gradient is the maximum permissible slope of a railway track. It is the ratio of the change in elevation to the horizontal distance over which the change occurs. The limiting value of cant gradient is 1 in 360, which means that for every 360 feet of horizontal distance, the track can rise or fall by 1 foot. This is the maximum slope that can be safely negotiated by trains.
Option B, 1 in 720, is not a valid cant gradient. Option C, 1 in 1000, is a valid cant gradient, but it is not the limiting value. Option D, 1 in 1200, is also a valid cant gradient, but it is not the limiting value.
The limiting value of cant gradient is 1 in 360 because this is the maximum slope that can be safely negotiated by trains. If the slope is
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