Working alone, pablo can put up a tent in 12 minutes. his mom can put it up by herself in 4 minutes. how many minutes would they take to put up the tent working together?

3 minutes

Step-by-step explanation:

we know that

Pablo can put up a tent in 12 minutes

so

100% of the work Pablo can do in > 12 minutes

In one minute Pablo can do (100/12)%

His mom can put it up by herself in 4 minutes

so

100% of the work his Mon can do in > 4 minutes

In one minute his Mon can do (100/4)%

therefore

Pablo and his Mon together in one minute can do

(100/12)%+(100/4)%=(400/12)%

By proportion find how many minutes would they take to put up the tent working together

1/(400/12)%=x/100%

x=12*100/400=3 minutes