Surfing For Physics Formulas For Power?

Lizzie asks…what will the travel time be for a 140 ton space craft sent from earth to orbit the moon producing 300lbf?what will the travel time be for a 140 ton space craft sent from earth to orbit the moon producing 300 lbf with an 8000 ISP and a exhaust velocity of 80,000v .. If it only does two orbits around the earth for gravity assist with the engines at full power. I've been looking on the net for the formula just to see what its max speed will be with even an Mars or Venus transfer

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