# Math Help - Centimetres into Seconds

1. ## Centimetres into Seconds

Hi guys,

I've got an equation that has been puzzling me. It's this :

If 5 seconds equals 11.5 cm then how can i find how many seconds is 3.3 cm or 2.5 cm ?

2. First of all, a unit of length can NEVER equal a unit of time.

If however, you are saying that this is a RATIO of time vs length, then set up the ratio as

5 sec : 11.5 cm

5/11.5 sec : 1 cm

10/23 sec : 1 cm

Can you go from here?

3. I'm a musician and not a mathematician so I'm still a bit puzzled by this. I understand the first two but not the 10/23 sec : 1 cm .

4. 10/23 = 5/11.5. The first fraction is obtained from the second one by multiplying both the nominator and the denominator by 2.