217
2024-10-23 11:00
admin
x=vt v=x/t=60km/4h=15km/h
v=15km/h-6km/h=9km/h
x=vt=(9km/h-6km/h)*4h=12km
x=60km-12km=48km
t=x/v=48km/(9km/h+3km/h-6km/h)=8h
441
439
432
427
395
383
376
373
371
366
