Respuesta :

mathmate

According to formula

Time in hours = d/2 + e/2

where d=distance in miles

e=difference in elevation in 1000 ft.

Therefore

d=9 miles

e=9000 ft/1000 ft = 9

Time in hours

= d/2 + e/2

= 9/2 +  9/2

= 9 hours.

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