Which expression can be used to find the surface area of the following square pyramid? A: 10+10+8+8+8+8
B: 100+40+40+40+40
C: 100+80+80+80+80
D: 100+80

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 is 10.6 according to my calculations