re: I GAVE you the numbers
"power is energy divided by the time in which the energy is released- it is a damn arithmatic problem- seriously do you find it difficult?"
I suppose time is the key here:)
You want as the answer the amount power released in a fraction of a second.
If the chemical reaction of TNT occurs at rate of 6900 m/s* and the distance involved is less than a 1/10 of a meter and therefore assuming all the energy will be release in less than 1/69000 of a sec, so roughly the amount power is 69000 times the energy expressed in joules. So, 4.2 million joules times 69000 is 289,800 million watts or about 290 million kilowatts occurring in about 1/69000 of a sec.
*I don't know if this is actually true.