It really varies with conditions, the weight, the obstacles enroute thus the cruise altitude to be reached...
Yes it's not that easy to calculate
exactly the amount of miles you can cover in exactly 60 minutes if you lose an engine at rotation.
We are not provided with any info about the climb rate in single engine, and it varies a lot with weight.
Let's assume a 1000 foot rate after cleanup.
Let's also assume a cruise altitude of 10000feet.
It's gonna take 10 minutes to reach 10000ft at 210 knots.
This covers about 40 miles.
Then I would use the
Long Range Cruise Control table of the QRH, ENGINE INOP, of course.
For a 50 tons (I've got the 400 22k table, but roughly it's the same for the 300) weight, at 10000ft it gives a speed of 279 kts, or . 5 mach.
5 miles a minute.
After our climb we are left with 50 minutes.
50 minutes at 5 miles a minute, makes 250 miles.
Take something for the slower approach speed, add the 40 miles covered in climb, and the result is...
280 miles.
And we have a winner!!!!!!!!!!!
LEM