You and a friend go to Tacos Galore for lunch. You order four soft tacos and three burritos and your total bill is $15. Your friend's bill is $9 for two soft tacos and two burritos. How much do soft tacos cost? How much do burritos cost?

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

there are infinitely many solutions.