Enter the graph at the bottom at 2400 nm, then go straight up to the ref line.

Then come back down to -25kts.

This puts you on the 2300nm line.

Then go up the graph and read off at 65,000ish - 14000kg.
Then go up to the trip time diagonal.

This reads off directly at 5.5 but don't forget to account for ISA dev.

Go back up a little to get the answer.

Oh, and don’t forget to convert to hours and minutes!!