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# I was driving on Interstate 90 and noticed in my rear view mirror a ca (1).docx

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# I was driving on Interstate 90 and noticed in my rear view mirror a ca (1).docx

I was driving on Interstate 90 and noticed in my rear view mirror a car that was rapidly approaching. I look at my speedometer and saw that I was going 72 miles per hour (I had my cruise control on). When the fast car passed me, I looked at my watch and began to count the number of seconds that had passed. I saw a bridge in the distance. When I reached 11 seconds, the fast car drove past the bridge. I continued to count and at 12 seconds, I drove past the same bridge.
How fast (miles per hour) was the other car going?
Solution
v*11=72*12
==> v=78.545 mi/hr
.

I was driving on Interstate 90 and noticed in my rear view mirror a car that was rapidly approaching. I look at my speedometer and saw that I was going 72 miles per hour (I had my cruise control on). When the fast car passed me, I looked at my watch and began to count the number of seconds that had passed. I saw a bridge in the distance. When I reached 11 seconds, the fast car drove past the bridge. I continued to count and at 12 seconds, I drove past the same bridge.
How fast (miles per hour) was the other car going?
Solution
v*11=72*12
==> v=78.545 mi/hr
.

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### I was driving on Interstate 90 and noticed in my rear view mirror a ca (1).docx

1. 1. I was driving on Interstate 90 and noticed in my rear view mirror a car that was rapidly approaching. I look at my speedometer and saw that I was going 72 miles per hour (I had my cruise control on). When the fast car passed me, I looked at my watch and began to count the number of seconds that had passed. I saw a bridge in the distance. When I reached 11 seconds, the fast car drove past the bridge. I continued to count and at 12 seconds, I drove past the same bridge. How fast (miles per hour) was the other car going? Solution v*11=72*12 ==> v=78.545 mi/hr