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.
Depending on traffic, it can be done in about 90 minutes.
That would depend on traffic, but about 4 hours.
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.