Answer:
Harry will take 21 seconds.
Explanation:
Speed of Harry = 
Since, Harry covers 12 miles in 6 minutes,
Then the speed of Harry = 
= 2 miles per minute
If he covers 0.7 miles then time taken by him will be,
Time taken = 
= 
= 0.35 minutes
≈ 0.35 × 60 seconds
= 21 seconds
The cliffs become over saturated with water allowing it to go down the mountain, causing catastrophic damage
Most cells have a membrane, though some don't.