Rescuing Apollo 13

Back in the 1970s, Apollo's 13 crew aborted their lunar landing due to a explosion in one of the oxygen tanks. Using the following data, our task is to... rescue the astronauts!

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Description Value
Earth's mass $5.97 \times 10^{24} \; kg$
Earth's radius $6.378 \times 10^{6} \; m$
Universal Gravitational Constant $6.67 \times 10^{-11} \; m^3/(kg \cdot s^2)$