Translate the word into a equation 15 is equal to 9 more than a number

Step-by-step explanation:

We'll go part by part.

"15 is equal to" so simple enough 15= now what is it equal to?

9 more than a number.  Well what does that mean?  it might help if we try out an actual number.  What is 9 more than 3?  12, so another way of writing that is +9.  It's not telling us the number we are adding 9 to so it's a variable.  So we'll say x + 9.

This leaves us with 15 = x + 9, which you could even solve.

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