Question 93

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)
=135 km/hr
Increase=135-108
=27 km/hr

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SSC CGL Tier-2-17-February-2018 Maths

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?

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