Answer:
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
