PLO Odds question

Anyone know this off the top of your head?

If your PLO hand is a 1-gapper and the flop hits your gap but no other useful cards, what are your chances of runner-runnering the strait?

Both for when the gap is in the middle and at the bottom (since only donks play the top gap).

I'm going to estimate here so don't sqabble over the math.

Lets say you are dealt 7,8,10,J and the flop is 9 4 2.

The odds that you will hit one of your cards on the turn is 20 outs, or about 40%. (you need a 6,7,8,10,J or Q) Lets say that card is a 8. Now on the river, you need either a 6,7,10,J or Q which is 17 outs or about 34%.

40% of 34% is about 13%.


so about 13% chance