Answer:
2.45 × 10³ km/h
1.52 × 10³ mi/h
Explanation:
The speed of sound in air is 340 m/s. If the speed of a supersonic plane is twice the speed of sound, its speed is 2 × 340 m/s = 680 m/s
1 hour is equal to 3,600 s. The speed expressed in m/h is:
680 m/s × (3,600 s/ 1 h) = 2.45 × 10⁶ m/h
1 kilometer is equal to 1,000 meters. The speed expressed in km/h is:
2.45 × 10⁶ m/h × (1 km/ 1,000 m) = 2.45 × 10³ km/h
1 mile is equal to 1.609 kilometers. the speed expressed in mi/h is:
2.45 × 10³ km/h × (1 mi/ 1.609 km) = 1.52 × 10³ mi/h
