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 (inkm/hr) to complete the lap in 12 minutes?
A) 24 B) 21 C) 27 D) 30
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Answer:it takes a complete lap =15min
Speed=108km/hr
Speed needed=?
Time that should be taken=12min
Speed needed = (15/12)×108=135km/hr
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