How much percentage should a racer increase speed to reduce the time by 20% to cover a fixed distance?
Answer & explanation
Correct answer: option 1
Time is reduced by 20%
Ratio of old to new speed = 5 : 4
Distance = Speed × Time
Speed is inversely proportional to time
So , Ratio of Speed is 4 : 5
Old and New distance both are same .
So , Percentage increase in speed = \(\frac{1}{4}\) × 100 = 25%