(1)K162从08:45到14:47,运行时间t1=6h2min=362min, D42从07:35到10:59,运行时间t2=3h24min=204min, 少运行时间t=t1-t2=362min-204min=158min. (2)D42运行时间t2=204min=12240s 平均速度v2==≈40.44m/s≈145.6km/h. 答:(1)动车组“和谐号”D42比快速Kl62少运行158min. (2)动车组“和谐号”D42从济南到北京的运行过程中的平均速度为40.44m/s;合145.6km/h. |