So the last day off 20 centuries is longer than the first day by 20 century. Times 0.1 2nd are essentially so, which is zero point your toe second. Now how do I get that? So in the problem, it say's that that day at the end of first century is one millisecond longer than the day at the start of the first century. So if we have ah, a century so the top one is the first day. Then let's say that zero. Then if the border matter is the last day, then the last day will be bigger by one millisecond, which is one times one divided by 1000 which gives us 0.0 zero one. Ah, second, So which tells us that yeah, uh, which tells us that at the end of 20th century, we just need to multiply that increase off seconds per century with the number of centuries that we have so that we can get rid of the centuries and we're left with the unit second, Now the average. If we want to calculate the average day, Ah, increase on the time span of 20 centuries, then we need to take the average off. Um, this time increased. Plus, we need to take the average of, uh, this increase because and in the beginning of 20th century, the time, let's say waas, whatever the time waas plus zero because there was no increase. Then it got increase by zero pines your two seconds, so the average is just half of it. So that's the average on Spann off 20 centuries. Um, so that that gives us 0.1 2nd So that means the average day during 20 centuries is the open 01 2nd longer than the first date since the on Since the increase Walker's uniformly that means tea will be accumulated. So total time t must be average increase in the length of day average increase. Ah, in the length off day. So in the length off day and we multiply that the number of days So that times, um, number off these. So how many days do I How do we have in a century? So every increase in the length off day is basically 0.1 seconds. We divide that by D because that's the, uh, thes in terms off D and then we convert. We convert the century from year toe day. So basically 3 65 0.25 ah, days is equal to and year, and we can multiply that with 2000 years with this 20 century. So as we see here that we need our final answer in seconds. That means we can get rid off days and years, which gives us 73 05 seconds, which is roughly equal toe two hours. So as we see here that, um, the total daily increasing time is a lot like two hours is really, um a big number. Thank you.