Respuesta :

2hour because raymond is useles

Step-by-step explanation:

thebecks

Answer:

72 minutes or 1 hour and 12 minutes

Step-by-step explanation:

in one hour Raymond would have done 1/3 of a job

in one hour Robert would have done 1/2 of a job

so in one hour together, they would have done 1/2+1/3 = 5/6 of a job

5/6 job = 1 hr

1/6 job = 12 mins

6/6 job = 72 minutes

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