At this time, the remaining workload is 5/1* (110+112) =112.
1/ 12- 1/ 10 * 1/2 = 1/30,
B It takes1/30/112 = 2/5 hours.
A * * * takes 5+5+ 1/2+2/5= 10 and 9/ 10 hours.
Let the train be x meters long and y meters/second.
22y=x+22
26y=x+3*26
The solution is x=330.
Summary of school leaders 1
Our class's 20xx New Year's Eve party ended successfully in the teaching building 12 classroom on February 28