A train from a to B, two hours 120 kilometers, with the same speed, from B to C 720 kilometers, in () hours? ①12 ②11 ③10

A train from a to B, two hours 120 kilometers, with the same speed, from B to C 720 kilometers, in () hours? ①12 ②11 ③10

A train from place a to place B traveled 120 kilometers in 2 hours. At the same speed, it traveled 720 kilometers from place B to place C in (1) 12 hours
①12 ②11 ③10

A train departs from place a to place B at 9:00 a.m. according to the original plan, it travels 120 kilometers per hour and arrives at place B at 3:00 p.m., but the actual arrival time is 5:00 p.m. and 2:00 p.m. later. Q: how many kilometers per hour does the train actually travel?

According to the original plan, the train takes 6 hours from 9:00 a.m. to 3:00 p.m., 120 times 6 (speed times time equals distance) to get the distance between Party A and Party B to be 720 km; the actual train takes 8 hours to arrive (9:00 a.m. to 5:00 p.m. is 8 hours), 720 divided by 8 (distance divided by time equals speed) to get 90; so the actual train runs 90 km per hour