Ethan ordered 4 sub sandwiches for a party. each 1/2 sandwich is one serving. dose he have enough that serve seven friends? how much is left over or how much more is needed? explain

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

it’s the first one your welcome