RIO DE JANEIRO — Exactly one year ahead of the start of Rio de Janeiro's Olympics, Mayor Eduardo Paes said on Wednesday that all the venues are running on schedule and will be delivered in time for next year's games — a feat he compared to a "miracle." Speaking in an under-construction arena to a crowd of several hundred journalists in hard hats, Paes said the progress of Rio's Olympic infrastructure proved that Brazilians were capable of delivering big projects on time and on budget. The South American nation came under sharp criticism for nail-biting delays and massive cost overruns on the stadia for last year's World Cup, and the International Olympic Committee has in the past expressed concerns about Rio's progress in preparing for the 2016 games.