SOLUTION: Jerry had a doctor's appointment at 10:00 am. The doctor's office is located 16.2 miles away from Jerry's house. John got in the car at 9:30 am, drove with an average speed of 25.4

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Question 985215: Jerry had a doctor's appointment at 10:00 am. The doctor's office is located 16.2 miles away from Jerry's house. John got in the car at 9:30 am, drove with an average speed of 25.4 mph.
Jerry ended up being late for the appointment. How much faster should he have driven (in mph).
Found 2 solutions by josgarithmetic, MathTherapy:
Answer by josgarithmetic(39617)   (Show Source): You can put this solution on YOUR website!

rate     time     distance
25.4     t+x       16.2


If t was expected time and x was the excess time, you have .

This system can be formed:


Two linear equations in the variables, t and x;
both can be found. These as set with the equations, will be in hours (actually fractions of an hour).
Answer by MathTherapy(10552)   (Show Source): You can put this solution on YOUR website!

Jerry had a doctor's appointment at 10:00 am. The doctor's office is located 16.2 miles away from Jerry's house. John got in the car at 9:30 am, drove with an average speed of 25.4 mph.
Jerry ended up being late for the appointment. How much faster should he have driven (in mph).


Time to get there: 30 minutes, or  hour

Speed at which he needs to drive to get there in exactly 30 minutes: , or 32.4 mph

Actual speed he traveled at to get there late: 25.4 mph. 

So, he should've travelled at least  (32.4 - 25.4) mph faster to get there in EXACTLY 30 minutes, or  hour 

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