# Rick

### How do you time 45 minutes given the following tools?

You've got two ropes, of unequal lengths. You also have a box of

matches. If you set either one of the ropes on fire at one end, it

will take one hour for it to burn up completely (all the way to the

other end). However, the rate at which the rope burns is not constant

(example, first half burns in 5 minutes, and the second half, in 55).

You don't know the burn rate as a function of position.

What do you do to use the two ropes to measure 45 minutes?

3 AnswersMathematics10 years ago### Probability of 4 shots in a row...?

If I shoot baskets UNTIL I miss, what is the probability of my making four in a row?

I can miss the 4th, 3rd, 2nd, or 1st shot PLUS I can make all four ... 5 possibilities ... I have a 1/5 chance of success or 20%,

Where does my SKILL level enter into it? Certainly Kobi Bryant has a better than 20% chance of making four in a row ...

2 AnswersMathematics1 decade ago