A 20 volume encyclopedia is lined up on a shelf. Each volume has an 1 inch of page and 1/4 of inch of binding on either side. A bookwork starts on the first page of the first book and eats to last page of the last book. How many inches does it eat through?

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