Question

an athlete decided to run the same distance in 1/4 th less time that she usually took .by how much parent will she have to increase her average speed?
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Answer 1

Explanation:

let be the original time s1,s2 be the two speeds

now new time=t-t/4=3t/4

now distance remaining same

t*s1=(3t/4)*s2

s2=4/3s1=(1+1/3)s1

so the athlete should increase his speed by one-third