Fred begins walking toward John's house at 3mph. John leaves his house at the same time and walks toward Fred's house on the same path at a rate of 2mph. How long will it be before they meet if the distance between the houses is 4 miles?
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Verified answer
John and Fred are walking towards each other at 3 + 2 = 5 mph.
The time to cover 4 miles in total is 4 / 5 hr. = 48 min.