The airspeed of an airplane is 200 km/h. When it is caught in a 200-km/h crosswind, its speed across the ground below is
A)0 km/h.
B)200 km/h.
C)283 km/h.
D)400 km/h.
E)1600 km/h.

Question

Quizplus · Accepted Answer

The speed across the ground will be the hypotenuse of a right triangle, with the airspeed and the crosswind speeds as the other two sides. We can use the Pythagorean theorem to find the answer:
Ground speed = √(200^2 + 200^2) = √(2 x 200^2) = √(80000) = 283 km/h (rounded to the nearest km/h). Therefore, the correct answer is Choice C.

The Airspeed of an Airplane Is 200 Km/h