One-storey yellow house

In a one-storey yellow house, there was a yellow person, a yellow cat, a yellow fish, a yellow shower, a yellow computer, a yellow chair, a yellow telephone, a yellow table – everything was yellow! What color were the stairs?

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It’s a one-storey yellow house so there weren’t any stairs

A non-stop train

A non-stop train leaves Moscow for Leningrad at 60 mph. Another non-stop train leaves Leningrad for Moscow at 40 mph. How far apartare the trains 1 hour before they pass each other?

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100 miles (60 + 40 = 100 miles)