About 3 hours.
From Cork city to Sligo town, depending on the route you take and the amount of traffic as you are travelling, it would take about four and a half hours.
About 2 hours.
At least 3 hours.
2.5 to 3 hrs.
Depending on traffic and where you are going to in Dublin, about 45 minutes.
You cannot actually get a train from Laois to Cavan. There is no rail lines in Cavan. You could get a train from Laois to Dublin and then from Dublin go on the Sligo line to get near Cavan, or take a bus from Dublin or a stop along the Sligo, probably Longford or Carrick on Shannon, depending on where exactly in Cavan you are going to.
That would depend on traffic, but about 4 hours.
Depending on traffic, it can be done in about 90 minutes.
Roughly 2 hours.
Depending on traffic, you could go from Dublin city to Cork city in as little as two and a half hours.
Less than 2 hours
About 43 miles or 70 kilometres, and would take about an hour.