David's horse

Algebra Level 2

David loves to ride his horse. When he is riding his horse, he travels at a rate of \(10\) mi/hr, and when he is walking, he travels at a rate of just \(3\) mi/hr. David goes on a \(4\)-hour trip, traveling for a while on his horse and walking the rest of the way, and travels \(29.5\) miles. For how many minutes was David riding his horse?

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