Based on the context and the answer, generate a question. 

Context: During the Spring bank holiday I met a friend who I had met before at an Easter caravan rally in Salisbury . We played on the steep hill on the farm site , with our bikes . I could n't ride up the hill because it was much too steep for my bike riding abilities , so I got off my bike and pushed it up then I got back on and flew down faster than a ferrari !

Answer:

They rode their bike .



How did they go so fast on the way down the hill ?