We know that Mr. John jogs for 1 hour x minutes in the morning every day.
To calculate the total time he will have spent jogging after two weeks (14 days), we need to convert the time in minutes to hours.
Since there are 60 minutes in an hour, we can write: 1 hour x minutes = 1 + (x/60) hours.
Multiplying by 14 (the number of days in two weeks), we get: 14 * (1 + (x/60)) = 14 + (14x/60) hours.
We are given that the total time he will have spent jogging after two weeks is 21 hours, so we can write: 14 + (14x/60) = 21.
Simplifying the equation, we get: 14x/60 = 7.
Multiplying both sides by 60, we get: 14x = 420.
Dividing both sides by 14, we get: x = 30.
The value of x is 30.
#### 30
The answer is: 30
Below is a math problem. Provide a detailed, step-by-step solution.

### Problem:
Mr. John jogs for 1 hour x minutes in the morning every day. How much time (in hours) will he have spent jogging after two weeks?
If we know the answer to the above question is 21, what is the value of unknown variable x?

### Answer:
