I want to know the answer to the following question:
When was The World Solar Challenge started?
All the background I'm provided with is that "In 1987, when it was founded, the winner's average speed was 67 kilometres per hour (42 mph) and by 2007 the winner's average speed had improved to 90.87 kilometres per hour (56.46 mph).". Is that enough to answer the question?
Answer: yes