A space capsule is orbiting Earth at a speed of 8 km/s. To achieve reentry, it needs to be slowed down to 5 km/s. If the mass of the capsule is 1500 kg, the retro-rocket fuel consumption rate is 10 kg/s, and the exhaust velocity is 3000 m/s relative to the capsule, for how long do the retro-rockets need to fire?
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