Answer:
the 2nd one
Step-by-step explanation:
mecause its new=original
If you already picked one wrong door then it is a 50/50 chance you will get the correct door or 1/2 or 1 of 2 or .5
The key concept you must have to remember is that, the rate is kept constant, as what is specified in the problem. Our basis for the rate is the first situation.
Rate = 20 facts/ 1 min.
Let's equate this to the second situation using x as the time unknown.
20/1 = 35/x
Solving for x,
<em>x = 1.75 minutes</em>