Answer:
17.057 mph
Explanation:
Speed= Distance Travelled ÷ Time Taken
As we know that: 1 yard = 0.000568 miles so
100 yard= 0.0568 miles
Time=12 seconds
To convert time from seconds to hour, we divide it 3600 because 1 minute is equal to 60 seconds and 1 hours is equal to 60 minutes so 60* 60= 3600 . Thus:
Time in hours = 12 ÷ 3600 = 0.00333 hour
Speed =0.0568 ÷ 0.00333
Speed= 17.057 miles per hour