Feat happens in Scooby-Doo Team Up #29 "The Ghost of Gorilla City - Part 1".
The Flash pushes the Mystery Machine from Central City to Gorilla City.
According to Wikipedia, Central City tends to change state but around the time this comc was published, it seemed to be in Kansas. No idea where Gorilla City is supposed to be...I'll assume somewhere in DRoC. Doing a rough border-to-border measurement, I get a distance of 11,914.655 km
So he traveled to almost Europe and said the trip to Gorilla City would be another minute. I know it's a figure of speech but it's all we got. Let's use a timeframe of 2 minutes as a low end and 5 as a high end.
11,914.655 km / 2 minutes = 99,288 m/s (Mach 289.469)
11,914.655 km / 5 minutes = 39,715 m/s (Mach 115.788)
He did this all while pushing the Mystery Machine
Average van weighs about 4079 lbs (sites down) or 1,850.203 kg.
- Shaggy: 160 lbs
- Daphne: 115 lbs
- Velma: 95 lbs (no way in hell she's lighter than Daphne)
- Scooby: 70 lbs
- Fred: 185 lbs (all muscle)
160 + 115 + 95 + 70 + 185 = 625 lbs (283.4952 kg)
1,850.203 + 283.4952 = 2,133.6982 kg
2,133.6982 * 0.5 * 99,288^2 = 1.0517113e+13 J
2,133.6982 * 0.5 * 39,715^2 = 1.6827211e+12 J
402 Tons of TNT
Should scale to Superman, Supergirl and thus, amped up Shaggy and Scooby.