Extracted text: Problem 3 Consider the casting of a pig-like art piece using ductile iron. Dimensions are shown below. Using the NRL method, design the riser needed. Hint: Simplify the shapes to make calculations easier. 100 mm Smm 60mm > + Smm Sem 5mm 30mm 100 mm (0 미 30mm Problem 4 In Problem 3, if the solidification time of the riser alone is around 30 secs, what would be the estimated solidification time of the casting alone? Hint: The same mold is used and it has a homogeneous composition.