It takes 60 minutes for 7 people to paint 5 walls,

61 Sum

How many minutes does it take 10 people to paint 10 walls?

Step-by-step explanation:

The time (minutes) vary directly with the number of walls and inversely to the number of people.

m = kw/p, where m = minutes, w = walls, and p = people

60 = 5k/7

420 = 5k

84 = k

m = 10 (84) / 10

m = 84