The time taken for formation of a goods train in flat yard is A. 2 hrs B. 1 hr C. 3 kmph D. None of these

The correct answer is D. None of these.

The time taken for formation of a goods train in flat yard depends on a number of factors, including the number of wagons to be coupled, the type of wagons, the length of the train, and the availability of personnel and equipment. In general, it can take anywhere from a few hours to several days to form a goods train in a flat yard.

Option A is incorrect because it is too short a time frame for the formation of a goods train in a flat yard. Option B is incorrect because it is too long a time frame for the formation of a goods train in a flat yard. Option C is incorrect because it is not a measure of time.