What is the slowest speed at which she could drive

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Alberta is going to have dinner at her grandmother's house, but she is running a bit behind schedule. As she gets onto the highway, she knows that she must exit the highway within 55{\rm min} if she is not going to arrive late. Her exit is 31{\rm mi} away. What is the slowest speed at which she could drive and still arrive in time.

Reference no: EM13287895

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