certain distance is covered in 10 hours at the speed of 40km/hour what should be the speed if the same distance to be covered in 480 minutes

He weights of 2-pound bags of best dog food are approximately normally distributed with a given mean  and standard deviation  according to the empirical rule, what percentage of the bags will have weights within 3 standard deviations of the mean? 47.5%68%95%99.7%