It takes 36 minutes for 7 people to paint 4 walls.
how many minutes does it take 9 people to paint 7 walls?

49 minutes

Step-by-step explanation:

It would take 49 minutes for 9 people to paint 7 walls.

4 walls need 262 people/minutes (7)(36)

9 people could do that in 49 minutes (441/9)

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

12

step-by-step explanation:

a triangle's   full angle is 180 degrees so 180 - 156 = 24. 24/2=12