What is it called when two waves combine to form a new wave?

Acommercial passenger jet can travel up to 970 km/hr at an altitude of 30,000 feet. at this speed, how long will it take the jet to travel 1,865 kilometers? a. 2.3 hrs b. 1.9 hrs c. 1.7 hrs d. 1.5 hrs

Aballet student who learns with the of his instructor is demonstrating learning.

What is the measurement of how fast an object moves relative to a reference point?