Answer:
[tex]h=\frac{70\ miles}{10\ miles/hr}[/tex]
[tex]h=7\ hours[/tex]
Step-by-step explanation:
Speed at which hot-air balloon flew = 10 miles/hr
Distance covered by balloon = 70 miles
Number of hours for which the balloon traveled [tex]h[/tex] =[tex]\frac{Distance}{Speed}[/tex]
So, [tex]h=\frac{70\ miles}{10\ miles/hr}[/tex]
∴ [tex]h=7\ hours[/tex]