1. Consider the following statements :
1. An ascending gradient of 1 in 100 meets an ascending gradient of 1 in 120 to form a Valley curve.
2. A falling gradient of 1 in 25 meets a falling gradient of 1 in 50 to form a summit curve.
3. The length of summit curve is determined on the basis of head light sight distance.
Which one of the statements given above is/are correct ?