Let's create a simple equation to find the number of minutes the jet will take to climb to 53,000 feet.
x = # of minutes
30,000ft + 1400x = 53,000ft
Subtract both sides by 30,000ft
1400x = 23,000ft
Divide both sides by 1400ft
x = 16.43
It will take the jet approximately 16.43 minutes to reach 53,000ft from 30,000ft