C) In preparation for a picnic, Kelly made a salad with 1/10 of a bag of iceberg lettuce and
7/10 of a bag of Romaine lettuce. How many bags of lettuce did Kelly use in all?

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

explanation:

step-by-step explanation: