What was the average speed of a winning solar powered car by 2007?
Development of a solar-powered car has been an engineering goal since the 1980s.
Какова была средняя скорость автомобиля-победителя на солнечных батареях к 2007 году?
Разработка автомобиля на солнечной энергии была инженерной целью с 1980-х годов.