In what setting do all frequencies of electromagnetic waves travel at the same speed?

You're fishing for "vacuum", but the question shows some uncertainty
with the concepts.

All electromagnetic waves travel at the same speed through vacuum.
That's a fact.

It's also true that they all travel at the same speed through jello, but it's
slower than their speed in vacuum.

The key point is that all electromagnetic waves travel at the same speed,
as long as you're measuring them all in the same material medium.

The speed is highest in vacuum, and some other different, lower speed
in different materials.

1) when you rub your hands together quickly, the kinetic energy is converted to mechanical energy.2) thermal energy from the sun travels to earth as infrared waves.3) energy is transferred through the matter of space by electromagnetic waves. 4) when a match is burned, chemical potential energy is converted to thermal and radiant energy. 5) seismicwaves are caused by back and forth movement , or vibration, of an object. 6) mechanicalenergy in an engine changes thermal energy into kinetic energy to make a car move.