[填空题]
A runner hopes to complete the 10,000-m run in le ;2 83 nyrbwk5o)hlddkss than 30.0 min. After exactlyyd;5 rh wkd kl2o)n3b8 s.uh-l4q7a hp 27.0 min, there are still 114hpu7l.a-qh s 00 m to go. The runner must then accelerate at $0.20 \; m/s^2$ for how many seconds in order to achieve the desired time? $s$
