(1)黄阿姨参加健康跑(全程7.5千米)项目比赛,跑完全程用时30分钟,黄阿姨平均每分钟跑多少米?
(2)李宏与张明都是全程马拉松的参赛选手。比赛开始后,李宏一直以180米/分的速度匀速前进,张明开始以220米/分的速度跑了1小时,然后减速以160米/分的速度前进。两人在距离起点多少千米处相遇?
同类型试题
y = sin x, x∈R, y∈[–1,1],周期为2π,函数图像以 x = (π/2) + kπ 为对称轴
y = arcsin x, x∈[–1,1], y∈[–π/2,π/2]
sin x = 0 ←→ arcsin x = 0
sin x = 1/2 ←→ arcsin x = π/6
sin x = √2/2 ←→ arcsin x = π/4
sin x = 1 ←→ arcsin x = π/2
y = sin x, x∈R, y∈[–1,1],周期为2π,函数图像以 x = (π/2) + kπ 为对称轴
y = arcsin x, x∈[–1,1], y∈[–π/2,π/2]
sin x = 0 ←→ arcsin x = 0
sin x = 1/2 ←→ arcsin x = π/6
sin x = √2/2 ←→ arcsin x = π/4
sin x = 1 ←→ arcsin x = π/2