5 miles in 90 minutes
1 mile in 90/5 = 18 minutes
1 mile is 5280 feet, so you are walking 5280/18 feet per minute = 293 and 6/18 feet per minute which is 293 and 1/3 feet per minute
1 minute is 60 seconds, so you are walking (293 and 1/3)/(60) feet per second
which is (880/180) = 88/18 = 44/9 = 4 and 8/9 feet per second or 4.8888 feet per second
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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.
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.
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.