Two cyclists depart from the same point. One travels due East at 18km/hr while the other travels North-West at 20km/hr. How long will it be before they are 80km apart?

Answer 1

80^2=t^2(20^2+18^2)

solve for time t.

Answer 2

Wonderful, thank you

Answer 3

Two cyclists leave a park and ride in opposite directions, one averaging 5 mph and the other 10 mph. If they have two-way radios with a 10-mile range, for how many minutes will they remain in radio contact?