Question
A racing car going at an average speed of 108 km/hr
takes 15 minutes to complete a lap on a racing track. By how much should it increase its speed (in km/hr) to complete the lap in 12 minutes?Solution
Distance of the lap=108*(1/4) =27 kilometers Time in which lap has to be completed=12 minutes=12/60 =1/5 hr Speed=27/(1/5) Â =135 km/hr Increase=135-108 =27 km/hr
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