Question

# The speed of a lightning bolt is approximately 320 million feet per second. What is the speed, in yards per minute? (1 yard = 3 feet)

- 160 million
- 960 million
- 6,400 million
- 19,200 million

## The correct answer is: 6,400 million

### 1 yard = 3 feet

1 minute = 60sec

So, 1 yard/ minute = (feet /sec) ⇒ 1 feet/sec = 20 yard /minute.

Applying the conversion 320 million

= 6,400 million (in yard /minute)

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