Answer:
 Time taken = 23.10 sec (Approx) 
Explanation:
Given:
Distance of lighting = 5 mi = 26,400 ft 
Air temperature =83.6°F = 28.67°FC
Computation:
Speed of the sound
V = 331 + 0.61 × T 
V = 331 + 0.6 × 28.67
 V = 348.202 m/s 
Distance = 5 mi = 8,046.72 m
 Time taken = Distance / Speed
 Time taken = 8,046.72 / 348.202
 Time taken = 23.10 sec (Approx)