anonymous one year ago 60 feet per second to km per hour? explain

• This Question is Open
1. jim_thompson5910

do you have anything so far?

2. anonymous

no

3. jim_thompson5910

ok let's first write 60 ft per sec as a fraction like this |dw:1441333787839:dw|

4. jim_thompson5910

how many seconds are in a minute?

5. anonymous

60

6. jim_thompson5910

to convert from seconds to minutes, we multiply by the fraction (60 sec/1 min) |dw:1441333859628:dw|

7. jim_thompson5910

notice how I put the "sec" unit on top so it cancels with the "sec" unit in the bottom |dw:1441333911367:dw|

8. jim_thompson5910

with me so far?

9. anonymous

yes

10. jim_thompson5910

we now have 60*60 = 3600 ft per min |dw:1441333993066:dw|

11. jim_thompson5910

how would we convert ft/min to ft/hr ?

12. anonymous

not sure, thats mostly what i get confused on

13. jim_thompson5910

how many min in an hour?

14. anonymous

60

15. jim_thompson5910

what fraction must you multiply by to have the "min" units cancel?

16. anonymous

3600 feet over 1 minute ?

17. jim_thompson5910

|dw:1441334074362:dw|

18. jim_thompson5910

agreed?

19. anonymous

yeah

20. jim_thompson5910

the min units will cancel leaving hr |dw:1441334154420:dw|

21. jim_thompson5910

what is the result after multiplying?

22. anonymous

216000 ft per 1 hour

23. jim_thompson5910

good

24. anonymous

then 3280 feet in 1 km so you would do 216000/3280 to get 65..85?

25. jim_thompson5910

I'm getting 1 km = 3280.84 ft approx

26. jim_thompson5910

so you'd have |dw:1441334457073:dw|

27. jim_thompson5910

|dw:1441334543977:dw|

28. jim_thompson5910

my calculator is saying 216000/3280.84 = 65.8367978932224

29. jim_thompson5910

so 60 ft/s = 65.8367978932224 km/hr approximately