Six years ago, John was three times as old as his dog at that time. If the sum of their
current ages is 28, how old are they now?

your answer would be 10x - 1

54 km / hours

step-by-step explanation:

we need to convert seconds to hours

60 seconds = 1 minutes

60 minutes = 1hour

15 m         60 second   60 minutes

  * *         = 54000 meters/ hour

second     1 minute             1 hour

now we need to convert meters to km

1000 m = 1 km

54000 m       1 km

*   = 54 km / hours

hour               1000m

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step-by-step explanation:

answer:

24pi or letter c