I think you mean 3 kilometers per 7 minutes.
speed = distance/time = 3km/7min = 0.5km/min (rounded to 1 significant figure)
If you did mean 7min per 3km, it would be 7min/3km = 3min/km (rounded to 1 significant figure)
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The rate is 609 kilometers per 7 hours. The unit rate is 609/7 = 87 kilometers per hour.
7 minutes after 3:00 would be 3:07. This is because you are adding 7 minutes to the original time of 3:00. In a 24-hour clock system, this would be expressed as 15:07.
3 minutes and 42 seconds.
3 hours 7 minutes.
If it is 7 minutes after 3, then it is 3:07.