A commercial jet has been instructed to climb from its present altitude of 9000 feet to a cruising altitude of 57000 feet. If the plane ascends at a rate of 4000 ft/min, how long will it take to reach its cruising altitude

Respuesta :

Answer:

12 min.

Step-by-step explanation:

9000+4000x=57000

4000x=48000

x=12