so, at 3 minutes per person ahead of you, you waited 5*3 = 15 minutes
Extra credit: How long did you have to wait for your photos?
There is an automatic photograph booth in my local shopping centre. It takes exactly 2 minutes
from the time that the money is inserted for the photographs to be taken, then the developed
photographs appear 4 minutes later.
Money may only be inserted when the green light is on. This light goes out immediately after
money is inserted, and comes back on again exactly 3 minutes later.
This morning, I arrived at the booth just as it was being switched on, and I was sixth in the
queue. The first person inserted their money immediately, and the rest of us all inserted our
money as soon as we were allowed to.
How long after I arrived at the booth did I insert my money?
1 answer
1 answer