Question

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?

Answer 1

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

Answer 2

Thank you :)