Package a contains 3 birthday cards and 2 you notes and costs $18. package b contains 8 birthday cards and 6 you notes and costs $50. if x represents the cost of a birthday card and y represents the cost of a you note, how much does each birthday card cost?

answer: 2530

hope this

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