You're walking at a speed of exactly 2.5 miles per 30 minutes.
In terms of a unit that may be more familiar to you, that speed
is equivalent to 5 mph.
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If I walk 1.5 miles in 30 minutes, then I'll walk 2 x 1.5 = 3 miles in 2 x 30 = 60 minutes = 1 hour, which is 3 mph.
It depends on how fast you walk.
It depends on how fast you are walking, although an average pace is between three and four miles an hour. So, call it between 15 and 20 minutes.
4.2 miles walking is 4.2 miles long., but if you look up "how fast does a human walk" you can do the math to get how long it will take to walk 4.2 miles: 4.2mi/2.5mph=1.68 hrs or 100.8 mins ballpark, depending on how fast you walk. see the provided link.
It depends on how fast you walk. A typical speed is 3 mph, so it would take one hour. But some people walk slowly and might require 3 hours to walk one mile, while others walk very fast and might cover that distance in 40-45 minutes, or even less.