John travels 56 miles in 3 hours before taking a break He then travels 38 miles in 2 5 hours Convert his average rate of miles per hour rounded to the nearest hundredth to meters per millisecond expressed in scientific notation rounded to the nearest hundredth 1 km 0 621371 mile A 7 64 10 3 2 95 10 3 m ms m ms 3 67 10 9 m ms