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Walter, Bill, and Tom want to decorate the multi-purpose room in school for a dance. It would take Walter and Bill 4 hours each to do the job and Tom alone could do the job in 3 hours. If all work together, how long will it take them to decorate the room?

 

 

Ok so you have 1/4 +1/3 that = 7/12

 

so 7/12  = 1 Hour 

12-7 = 5 (remaning time)

\(5/12=60\)    (60 is 60 mins)

Divide everything by  12

 

so you get that 5/12=5mins

So you do 5*5 to get  answer

so answer is 1 hour and 25 mins 

this was rong idk what to do

 

NOTE i cant just put in 1 and 5/12 of an hour it needs to be hours and minitues

 Jan 27, 2020
 #1
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Walter rate  = 1job / 4 hr

Bill      rate   = 1 job /4hr

Tome rate    = 1 job /3 hr

 

1 job / (rates) = time for all three working to complete the jub

 

1 job / ( 1/4 + 1/4 + 1/3)   =         ?      Hours

 Jan 27, 2020

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