Watts 500 WHOTEEL Electric Scooter with Seat, 819W Peak 500Wh Battery 25 Miles Range 20Mph Top Speed, Foldable Electric Scooter for Adults with Basket, Black 500 WHoteel Electric Scooters for Adults, 14" Fat Tire, 25 Miles...
5.一列火车通过1100米的桥需要1分钟,以同样的速度穿过500米的隧道需要30秒.这列火车的速度是每秒( )米,车身长( )米.6.甲火车长290米,每秒行20米;乙火车长250米,每秒行25米.两火车的车头刚好同时在长900米铁桥的两端相对开出,几秒钟两车的车为相错而过?