Math Problem Statement

Complete the table.

A jogger and cyclist started at the same point and traveled for 3 hours in opposite directions until they were 66 miles apart. The cyclist traveled 11 mph faster than the jogger.

Rate · Time = DistanceRateTimeDistance

Jogger

x

3

 x

Cyclist

y

3

 y

Total

Write a system of two equations that can be used to find x and y. DO NOT SOLVE THE SYSTEM.

   x +  y = 66

y = x + 

Solution

We are given that the jogger and cyclist traveled in opposite directions for 3 hours and were 66 miles apart. The cyclist's speed is 11 mph faster than the jogger's speed.

Let:

  • xx be the jogger's speed in mph,
  • yy be the cyclist's speed in mph.

From the information given, we can create two equations:

  1. The total distance covered by both the jogger and cyclist in 3 hours is 66 miles. Since distance = rate × time, the distance the jogger covers is 3x3x, and the distance the cyclist covers is 3y3y. Therefore, the first equation is: 3x+3y=663x + 3y = 66 Simplifying, we get: x+y=22x + y = 22

  2. We are also told that the cyclist’s speed is 11 mph faster than the jogger’s speed. So, the second equation is: y=x+11y = x + 11

Thus, the system of equations is: x+y=22x + y = 22 y=x+11y = x + 11

This is the system of equations that can be used to find xx (the jogger's speed) and yy (the cyclist's speed).

Would you like any additional details or have further questions?

Here are five related questions for deeper understanding:

  1. How do we solve the system of equations for xx and yy?
  2. What would happen if the cyclist's speed were 5 mph faster than the jogger's speed?
  3. Can we generalize this problem to any time duration other than 3 hours?
  4. How would the system change if the cyclist and jogger traveled in the same direction?
  5. What is the physical interpretation of each term in the equation?

Tip: Always check if a system of equations can be simplified before solving—this often makes solving easier.

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Math Problem Analysis

Mathematical Concepts

Algebra
Systems of Equations
Linear Equations

Formulas

Distance = Rate × Time

Theorems

Solving Systems of Linear Equations

Suitable Grade Level

Grades 8-10