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A 8.0*10^4 kg spaceship is at rest in deep space. It's thrusters provide a force of...

A 8.0*10^4 kg spaceship is at rest in deep space. It's thrusters provide a force of 1200 kN. The spaceship fires its thrusters for 20 seconds, then coasts for 17 km. How long does it take the spaceship to coast this distance?
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