ANSWER: 21.235 m/s
Explanation:
Distance travelled: 38 miles, 61155.1 m(SI unit of speed or average speed is m/s so distance has to be in meters and time has to be in seconds)
Time taken:48 minutes, 48×60 seconds= 2880 seconds
Average speed= total distance by total time taken: 61155.1/ 2880= 21. 235 m/s