Distance between train 1 and train 2 = 95 miles. average speed of train 1 = 45 mph. average speed of train 2 = 60 mph. train 1 is ahead of train 2 on the same track. how long before train 2 would overtake train 1 if neither train is re-routed?

Do one of the following, as appropriate: (a) find the critical value z subscript alpha divided by 2 , (b) find the critical value t subscript alpha divided by 2 . 99%; nequals 17; sigma is unknown; population appears to be normally distributed.