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John drives at an average speed of 80 km/h and travels the distance from home to work in 30 minutes. What must his average speed be if John wants to travel the same distance in 20 minutes?

Explanation

Answer: E - The speed must be 120 km/h if John wants to travel the same distance in 20 minutes. Speed and time are inversely proportional; when the speed increases, the time decreases.

80:x = 20:30
20x = 80×30
x = (80×30)/20 = 120
Therefore, John must drive 120 km/h to travel the same distance in 20 minutes.

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