20 points pls help. Working alone, Ryan can dig a 10 ft. by 10 ft. hole in five hours. Castel can dig the same hole in six hours. How long would it take them if they worked together?

2.72 hours

Step-by-step explanation:

Ryan digs 1/5 hole per hour

Castel digs 1/6 hole per hour

together they dig 1/5+1/6=11/30 holes per hour

11/30/hr divide by 11 to find out 1/30 of a hole per hour

1/30 and multiply by 30 to get a complete hole

1 hole=30/11=2.72 hours

Sorry, I can't move the boxes around

answer: 80,000

step-by-step explanation:

the population doubles every day.

10,000*2=20,000 day 4

20,000*2=40,000 day 5

40,000*2=80,000 day 6