How you do this is using the formula speed = distance/time. So this is 100/5 which is 20 meters a second. Using the conversion factor (can google "20 meters per second is how many mile") 20 meters a second = 44.7 miles per hour.
In conclusion, the answer you're looking for is D. 44.7 miles per hour.
Yes. it would be 1 and 18/30 or 1 9/15. it can also be 1 and 3/5 or 8/5
Sine is also known as Opposite over hypotenuse.