Tiana can clear a football field of debris in 3 hours. Jacob can clear the same field in 2 hours. If they decide to clear the field together, how long will it take them?

~ 50 minutes
~ 1 hour 5 minutes
~ 1 hour 12 minutes
~ 5 hours

Question

Tiana can clear a football field of debris in 3 hours. Jacob can clear the same field in 2 hours. If they decide to clear the field together, how long will it take them?

~ 50 minutes
~ 1 hour 5 minutes
~ 1 hour 12 minutes
~ 5 hours

anonymous · Answer

Tianas debris clearing rate is 1/3 football fields per hour and Jacob´s 1/2.
1/3*t+1/2*t=1

anonymous · Answer

1/3*t+1/2*t=1

Combine like terms
5/6*t=1

Divide both sides by 5/6
t=1.2

1.2 hours = 1 hour and 12 mins.
Correct?