Physics

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A light–rail commuter train draws 635 A of 640–V DC electricity when accelerating. What is its power consumption rate in kilowatts?
(in kW) 406 kW
You are correct.

How long does it take to reach 30.0 m/s starting from rest if its loaded mass is 4.90×104 kg, assuming 93.0% efficiency and constant power?
(in s) 58.3 s
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Find its average acceleration.
(in m/s^2) 0.514 m/s^2
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What is the ratio of the acceleration you found for the light–rail train compares to what might be typical for an automobile? (A typical automobile can accelerate from 0 to 60 mph in 10 s.)

Need help with the last question please! I found the automobiles acceleration to be 2.778 and I divided that by the acceleration i found for the train:
2.778/.514=5.40 but it isn't the right answer. What am I doing wrong?

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