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A sport car going at an average speed of 108 km/h takes 15 minutes to complete a lap on a racing track. How much speed (in km/h) should be increased to complete the lap in 9 minutes?

A sport car going at an average speed of 108 km/h takes 15 minutes to complete a lap on a racing track. How much speed (in km/h) should be increased to complete the lap in 9 minutes? Correct Answer 72

Distance covered by the car in one lap = 108 × 15/60

⇒ 27 km

So, to complete a lap of 27 km the speed of car must be = 27/(9/60)

⇒ 180 km/hour

⇒ Increased speed should be 180 – 108

∴ Increased speed should be 72 km/hour

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