A racing car going at an average speed of 108 km/hr takes 15 minutes t
| 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?
A. 24
B. 21
C. 27
D. 30
Right Answer is: C
SOLUTION
Let the distance of track be 
.
A.T.Q 
New speed = 27 × 60/12 = 135 km/hr
Required = 135 – 108 = 27 km/hr .
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