Question

Gabriella drives her car 380 miles an average a certain speed if the average speed had been 9 mph less she could’ve traveled only 320 miles in the same length of time what is her average speed

Answer 1

Answer:

Step-by-step explanation:

First you need to know that speed = distance divided by time, or s = d/t.  We are going to use this to set up a system of equations.

The first part tells us s = 380/t and the second part modifies that saying s-9 = 320/t.  Now from here you want to solve for s in the last step, so you'd want to solve for t in the first step.

s = 380/t

s-9 = 320/t

So, you want to solve one of them for t, then plug that into the other equation so all terms are only in terms of s.  Can you handle it from there?  If not I can walk you through it further.  

Answer 2

Answer:

First you need to know that speed = distance divided by time, or s = d/t.  We are going to use this to set up a system of equations.

The first part tells us s = 380/t and the second part modifies that saying s-9 = 320/t.  Now from here you want to solve for s in the last step, so you'd want to solve for t in the first step.

s = 380/t

s-9 = 320/t

So, you want to solve one of them for t, then plug that into the other equation so all terms are only in terms of s.  Can you handle it from there?  If not I can walk you through it further.  

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Step-by-step explanation: