REVERE – After a car struck an 8-year-old girl Friday outside the Whelan Elementary School, police are warning drivers that children from two Revere schools get dismissed around sunset.Children who participate in an extended school day program at the Whelan School on Newhall Street and the Garfield School on Garfield Avenue are released from classes at 3:55 p.m.A GMC Sierra pickup truck was traveling about 20 mph when it struck Samantha Almeida, 8, of 61 Fenley St., Revere, at about 4:10 p.m. Friday at the corner of Newhall and Fenley streets. Almeida was walking within the crosswalk, police said.Police Capt. Michael Murphy says the girl suffered no serious visible injury but was transported anyway to Mass. General Hospital.The captain says drivers need to be particularly careful around the two schools in the coming months as the sunset gets earlier.”Due to the extended school day, many children will be walking home in the dark,” Murphy said.The driver who struck the girl, Charles Burdick, 26, of Allenstown, N.H., was cited for failing to yield to a pedestrian in a crosswalk, Murphy said.