Posted by **Olivia ** on Saturday, November 24, 2012 at 5:13am.

A runner is 22 km east and 15 km south of his starting point, how long would it take him to return to his starting point in a direct Line if he can run at 10 km per hour?

- Math -
**drwls**, Saturday, November 24, 2012 at 6:41am
When starting the return, the straight-line distance from the starting point is:

sqrt[(22)^2 +(15)^2] = 26.63 km

Divide that by the speed for the time required, and you get

2.663 hours, whiich is 2 hours, 40 minutes

- Math -
**Olivia **, Saturday, November 24, 2012 at 7:51am
Thank you :)

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