Posted by **Bala** on Tuesday, October 5, 2010 at 9:16pm.

An 18-year-old runner can complete a 10.0-km course with an average speed of 4.48 m/s. A 50-year-old runner can cover the same distance with an average speed of 4.18 m/s. How much later should the younger runner start in order to finish the course at the same time as the older runner?

- Physics -
**Emily**, Tuesday, October 5, 2010 at 9:17pm
k i got this one..

find the t it takes for each runner using t=d/v....then subtract the times, and you have the answer !

- Physics -
**Bala**, Tuesday, October 5, 2010 at 9:27pm
thnx......i found out my mistake. i didnt convert the distance to meters :)

- Physics -
**Emily**, Tuesday, October 5, 2010 at 9:31pm
okay ! and which q'n did u get 255 m for?

- Physics -
**Bala**, Tuesday, October 5, 2010 at 9:35pm
lol sorry ma internet went all hay wire on me!!!

i got 255 m for the entire run for questin 7

- Physics -
**Emily**, Tuesday, October 5, 2010 at 9:44pm
kk got that. did you get number 18?

- Physics -
**Bala**, Tuesday, October 5, 2010 at 10:00pm
no i didnt. did you get 13 and 14

- Physics -
**Emily**, Tuesday, October 5, 2010 at 10:06pm
nope :(

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