Explanation:
1. formula:
speed=distance/time
speed= 624/12
speed= 52
2. formula:
speed=distance/time
speed= 864/32
speed= 27
3. formula:
speed=distance/time
speed= 972/27
speed= 36
4. formula:
speed=distance/time
speed= 714/14
speed= 51
5. formula:
speed=distance/time
speed= 1125/25
speed= 45