A car travels at 72 km/h. Its gap to the car ahead is 20 m. How long is this gap in seconds?

Answer and explanation

Correct answer: D. 1 second

  1. Step 1: 72 km/h is 72 / 3.6 = 20 m/s. Step 2. 20 m at 20 m/s is 1 second. Answer: 1 second. Why not the others: 2 seconds: at 72 km/h two seconds is 40 m. 0.5 seconds: half a second is only 10 m at 72 km/h. 3.6 seconds: this divides by 20 instead of converting units.

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