Two buses leave at the same time. One heads due to east at 40kph and one heads due to north at 30kph. How far apart are the buses after two hours?

Answer 1

100 km

it's a right triangle with sides 30(2) and 40(2), with hypotenuse = 50(2)

d^2 = 60^2 + 80^2 = 3600+ 6400 = 10000

d = sqr10000 = 100 km