the problem says: cyclists lance and alberto each average 30km/h for the first hour of a 100 km race. At the end of the first hour lance crashes and loses 12 mins. alberto finishes the remainder of the race at an average of 25 km/h and lance averages 27.5 km/h after starting up again. How long after the START of the race will lance catch up?

I have been trying and everyone i know cant get it. i have an answer but i have nothing to base it off of to see if it is right. I would include my work but it is all over and trying to put it into words in a forum would be hard.

Thanks