The speed of sound in air is 60 m/s. How far from the centre of a storm is an observer who hears a thunder clap 4s after the flash of the lightning?
A
140m
B
100m
C
340m
D
240m
Verified Correct Answer: D.
Step-by-Step Mathematical Solution
Speed of sound = 60 m/s
Time delay = 4 s (light travel time is negligible)
Distance = speed × time = 60 × 4 = 240 m
Source: WAEC / JAMB / NECO Classroom Archive (Record #74545)