Question

A car travels from town A due north to a town B 4km away.it then travels due easy until it arrives town C 5km from B
Determine the distance betweeen town C and A

Answer 1

The 4 and 5-km roads are perpendicular, which means we can use Pythagorean theorem to calculate the distance:

$$d=\sqrt{4^2+5^2}=6.4\text{ km}.$$