Seems they are using microsatellites, orbiting closer to address the latency issue. Light travels 186,000 miles/second. The 750 mile figure divided by 186,000 simplifies to 1/1240 seconds x2 for round trip is then 1/620, or close to 1 1/2 thousandths of a second. Multiply by 2 again which is 1/310 for round trip back to ground station. So just under 3/1000 of a second. Still negligible and really good
Of course, pings going over the public internet will be higher, but this satellite link seems it will have negligible latency. I have hated Google lately for recent stunts they pulled, but I sure hope they succeed in this as it could open the gate for worldwide ISPs to add competition. ISP bought laws to bar competition be damned.