Guys, I'm really hopeless at maths. I have a problem. A rather nasty crime has been committed and we have CCTV of a possible perpetrator, but much depends on timings. We've taken pains to get accurate times for the two best CCTV images but unfortunately one is only stated to the minute. Taking that timing at the midpoint of that minute the elapsed time between the two images is 2 minutes and 8 seconds. Obviously that figure has ±30 secs uncertainty. The distance between the two image locations is exactly 350 metres. I need to know: (a) What speed would the suspect need to be doing if the time taken to travel 350m was 2mins 8secs minus 30 secs? (b) What speed would the suspect need to be doing if the time taken to travel 350m was 2mins 8secs plus 30 secs? (c) What speed would the suspect need to be doing if the time taken to travel 350m was exactly 2mins 8secs? We know the maximum speed of his (rather unusual) mode of transport; what we're trying to figure is whether he would have time to pause and commit his crime halfway along the 350m distance.
Bill