1. radioactive decay of 40k atoms in an igneous rock has resulted in a ratio of 25 percent 40k atoms to 75 percent 40ar and 40ca atoms. how many years old is this rock?

Mike and mitchell decide to have a foot race. they mark off a stretch of 100 yards, and recruit cindy to work the stopwatch. after running the race and looking at the results, cindy declared that mitchell was the fastest. so how did the boys times compare?