The speed of man-made satellite is about 7.9 kilometers per second. The speed of man-made satellite is 2 / 3 of that of spaceship. How many kilometers per second does spaceship run? Who can answer that?

The speed of man-made satellite is about 7.9 kilometers per second. The speed of man-made satellite is 2 / 3 of that of spaceship. How many kilometers per second does spaceship run? Who can answer that?


7.9 △ 2 / 3 = 7.9 × 3 / 2 = 11.85 (km)
A: the spaceship flies about 11.85 kilometers per second
The second solution is easy to understand
Let the speed of the spaceship be X
2/3x=7.9
x=11.85
A: the spaceship flies about 11.85 kilometers per second
[if you haven't learned the first solution of equation, you'd better use the second solution of equation]