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**Force and Motion.....**

hi

could someone please tell me where i am going wrong with this question:

A freight train has a mass of 1.20E+7 kg. If the locomotive can exert a constant pull of 6.10E+5 N, how long does it take to increase the speed of the train from rest to 83.4 km/hr?

i tried to find accelertion by using F=ma, and i keep getting 0.05833....then i put it into the equation v=vo+at, but my answers never turn out right. i think maybe unit conversion is where i'm going wrong.....but i'm not sure.

help would be appreciated...

thanks, lilly