a hare & a tortoise have a race along a circle of 100 yards diameter.the tortoise goes in 1 direction & hare in another.after the tortoise has covered 1/5th of its distance & that is too leisurely.the hare & tortoise meet when the hare has covered only 1/8 th of the distance.by what factor should the hare increase its speed so as it to tie the race?
5
8
37.80
40

please explain

• assume tortoise as T
  hare as H
  T upon covering 1/5th,H starts running!
  after H covered 1/8 that is T covered 7/8 they meet.
  let the time when H starts to when he reaches at 1/8th of the total as 't',that is equal to T's covering of (7/8-1/5)=27/40
  T covers 27/40 at 't' time.
  then T covers remaining 1/8th in (40/27)t/8 t=5/27t
  
  now in this time H has to reach the finishing point.
  initially H goes 1/8th in t
  then 7/8 th in 7t.
  
  thus speed should be increased=7t/(5/27)t =37.8 :)
• 14 years agoHelpfull: Yes(20) No(0)
• 37.80
• 14 years agoHelpfull: Yes(2) No(6)
• The trick for this question is that the answer with the decimal is wright because the software for the online written paper of TCS has some flaw which gives a decimal in this question. But it’s not with other questions.
  so the answer is 37.80
• 13 years agoHelpfull: Yes(1) No(1)
• As here when hare start the race tortoise has cover 1/5 th of distance.
  at the point when they meet hare cover 1/8 and tortoise cover 7/8 of the distance.
  the distance travel by tortoise when hare cover its 1/8 distance = 4/5-1/8
  = 27/40.
  let speed of tortoise is t and hare is h before the point they meet then.
  27/40t=1/8h
  t= 27/5h
  after the point they meet distance travel by tortoise is 1/8 and by hare is 7/8 to finish the race
  let new speed of hare= H( after the point when they meet)
  tortoise=t
  7/8H=1/8t
  H=7t
  H=7*27/5h
  H=189h/5
  H=37.8h
  
  
• 13 years agoHelpfull: Yes(1) No(0)
• d=100
  2*pie*r=314.15
  h covers=.5*314.15=62.83
  they both meet at=.8*314.15=39.26
  so
  h need to cover 212.06(314.15-(62.83+39.26)) at t
  1 at t/212.o6
  39.26 at 39.26t/212.06----------A
  
  again similarly
  for T
  39.26 covers at t
  1 covers at t/39.26
  314-39.26=274.89 covers at .. 274.89t/39.26.........B
  
  divide equation B/A= 37.80
• 14 years agoHelpfull: Yes(0) No(3)