A jogger wants to save ?th of his jogging time. He should increase his speed by how much %age

• question:A jogger wants to save 1/4th of his jogging time. He should increase his speed by how much %age.
  Distance = Speed*Time
  Here, we are assuming that the distance the jogger wants to run is the same
  So,
  Let Old speed = s and Old time = t. So, Distance = st
  New time = 0.75t
  So, new speed = st/0.75t = s/0.75 = 1.33s
  So, he should increase his speed by 33%
• 10 years agoHelpfull: Yes(33) No(14)
• Considering the question: A jogger wants to save 1/4th of his jogging time. He should increase his speed by how much %age?
  
  Answer:
  let us assume that he runs the same distance(d), and his old speed and time be s1 and t1 resp.
  s1= d/t1------(1)
  now he has to decrease or save 1/4th of his old time t1.
  so new time (t2)= 0.75t1
  new speed (s2)= d/(.75t1)------------(2)
  difference in speed(s)= d/(.75t1) - d/(t1) = (0.25*d)/(0.75t1)
  therefore percentage increase in speed= (difference in speed*100)/new speed
  = (0.25*d)/(0.75t1) * (0.75t1)/(d) * 100%
  =25%
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• please send it to me sganguly134@gmail.com
  
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