## Rubie 3 years ago 400m run. I'm faster than my partner by 4sec/ 1m. My partner finished the run in 50seconds. how do I create an equation and solve for this ?

1. vipul92

400/50=8m/sec.

2. Rubie

can you show your method ?

3. vipul92

so yur 8.25 so tim=400/8.25

4. whatisthequestion

Okay Rubie why don't we start by calculating the speed of your partner. Now you will have to calculate it in sec/m unless that was a typo earlier. I will let you do the calculation and step in if necessary.

5. whatisthequestion

vipul if you are wondering why I said to give it in sec/m it is because that is the way they gave the realtionship between the runners. I may not reply for a few minutes here I need to do something quickly.

6. Rubie

ohh okai so 400/50 ?

7. whatisthequestion

no track your units. the numbers you gave me up there would render m/s the relationship they gave us was in s/m . you need to get those units

8. Rubie

nvm.... i'll just leave this question out then o.0

9. whatisthequestion

50/400 is the correct first step giving you a speed of 0.125 s/m

10. whatisthequestion

Unfortunately I think you have a typo here as if you are faster than your partner by 4 s/m then your speed is 0.125-4 = -3.75 s/m which is impossible

11. whatisthequestion

$\frac{ s }{ m }$ or $\frac{ m }{ s }$ which is the unit your relationship is given in?