Answer:
96 hours
Explanation:
Because they are expecting half of the team to do the whole foundation, you can double the time to even the equation out. In other equations, you can figure it out another way but this one is very simple!
Originally:
6 people | 48 hours
Now:
3 people | x hours
x=48*2
x=96
This is just my way of solving this, there are many other ways to do this though! :)