Equation and Inequalities

Word problems by Yui Taniguchi, 4th

My theme - bicycle

Two step equation

Today, I had schedule to play with my friends in the park. The distance between my house and the park is 1530 meters. When I was going to the park, I rode my bicycle with the speed of 100 meters per minute. But, after some minutes I became tired and I walked 430 meters of rest. Let use x for the time of riding bicycle and solve it.
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Two step inequality

Everyday, I ride my bicycle. The speed of my bicycle is 255 meters per minute. And, I walk 20 minutes with speed of 85 meters per minute. Today, I want ride and walk at least 7565 meters total. How long do I need to ride if I want ride and walk at least 7565 meters total?
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Multi step equation

My sister told that she goes to library and got out from home. The distance between our house and library is 4920 meters. After 12 minutes, I noticed that my sister forgot her book and I started to follow her using my bicycle. My sister's walking speed is 80 meters per minute and my bicycle's speed is 250 meters per minute. How long it takes to reach my sister?
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Variables on both sides

Today, in the morning, I rode my bicycle and I ran 892 meters with my bicycle. It was 46 minus from 2 times of distance that my sister ran with her bicycle this morning. How many meters did my sister run with her bicycle?
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Why did I choose bicycle for theme?

I chose bicycle for my theme because I like to ride bicycle and go park or shopping. In Japan. I use my bicycle and go to park or my friend's house. Now, I don't have bicycle in America so I want ride my bicycle when I get one or when I go back to Japan.