Task: Question Generation
Input (English): Plymouth is served by Plymouth Hospitals NHS Trust and the city's NHS hospital is Derriford Hospital 4 miles (6 km) north of the city centre. The Royal Eye Infirmary is located at Derriford Hospital. South Western Ambulance Service NHS Foundation Trust operates in Plymouth and the rest of the south west; its headquarters are in Exeter.
Output (English): In kilometers, how far is Derriford Hospital from the Plymouth city center?