Roy drove at a speed 30% greater than usual speed when he is outside the city limits. If he normally drove at 60 kmph in the city, then how long did he take to do a 624 km stretch on the highway?

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Roy drove at a speed 30% greater than usual speed when he is outside the city limits. If he normally drove at 60 kmph in the city, then how long did he take to do a 624 km stretch on the highway?