Question

18) It takes Jimmy ten hours to dig a 10 ft by 10ft hole. Rob can dig the same hole in eighthours. If they worked together how longwould it take them?

Answer 1

x/10+ x/6 =1

Multiply both sides by 60

6x+10x=60

Combine like terms

16x = 60

Divide both sides by 16

x = 60/16

x= 3.75 =15/4 = 3 3/4 hours

3/4 = 45 minutes

3 hours and 45 minutes