tim and elan are 90 km from each other.they start to move each other simultanously tim at speed 10 and elan5 kmph.if every hour they double their speed what is the distance that tim will pass until he meet elan (A)45(B)60(C)20(D)80

• best solution i can give for this kind of problems is...
  
  remember Tim and elan are always traveling in 2:1 ratio..
  and total distance is 90km
  tim ratio=2
  total ratio= 2+1=3
  formula = total distance*(tim ratio/ sum of total ratios)
  so answer is 90*(2/3)=60
  
  suppose if you want elan's distance ,it is 90*(1/3)=30
  
  
  
• 12 years agoHelpfull: Yes(143) No(17)
• ans is B(ie) 60
  1st hour=tim 10kmph elan 5 the dist will be 90-15=75
  2nd hr=tim->20kmph & elan->10 dist=75-30=45
  3rd hr =tim->40 & elan->20..the totl dist for 3rd hr is 60.but we need only 45km to meet ..so we consider only 45mins instead of 3rd hr..
  In 45mins =>tim ->30 & elan->15
  totl dist travld by tim is 10+20+30=60
• 12 years agoHelpfull: Yes(54) No(3)
• Speed is directly proportional to Distance speed is in the ratio 10:5.Even the speed is doubled for every one hour ratio remains constant.so distance of Tim travel is 2/3*90=60
• 12 years agoHelpfull: Yes(21) No(1)
• let tim covered the distance by speed 10kmph and elen covered by 5kmph
  the total relative speed is 10+5=15kmph
  time=distance/speed
  time=90/15
  time=6 hour
  they will meet in 6 hours
  tim covered the distance in 6 hours is=10*6=60km
  ANSWER= B
  
• 9 years agoHelpfull: Yes(11) No(5)
• ans is 60..
  calculate by both side hour by hour .. keep in mind that after every hour speed will b doubled ...
  so ans will b 60...
  if u wil try to eliminate option n get ans u can also do that ..
  in that u will get 55 and 45 for tim and elan respectively but in ans approx u can say 60 bcz before that he wil meet him
• 12 years agoHelpfull: Yes(8) No(2)
• tim 10+20=30km in 2 hr
  elan 5+10=15 in 2 hr
  total 45 km they have coverd. remaining 45 km
  45/(40+20)=3/4 hr
  (3/4)hr*40km/hr=30km
  so they meet after 30 km in remaining 45 km
  but jim has already travelled 30 km so 30+30=60km jim has travelled when they meet
• 11 years agoHelpfull: Yes(8) No(0)
• speed ratio is 2:1 so distance too vl be in same ratio
  so 60:30
  so tim covers 60 km
• 8 years agoHelpfull: Yes(1) No(0)
• Let the daughter be A, B, C
  
  let the dresses be 1, 2, 3
  
  1 ⇒
  
  A
  
  A
  
  B
  
  B
  
  C
  
  C
  
  2 ⇒
  
  B
  
  C
  
  A
  
  C
  
  A
  
  B
  
  3 ⇒
  
  C
  
  B
  
  C
  
  A
  
  B
  
  A
  
  
  
  Total Cases = 6 Ways
  
  Total Ways by which none gets their own dress = 2
  
  Probability = Successful Outcomes / Total Outcomes = 2 / 6 = 1 / 3
• 6 years agoHelpfull: Yes(1) No(1)
• 60
  is the answer
  
• 12 years agoHelpfull: Yes(0) No(2)
• ans is 60
  
• 12 years agoHelpfull: Yes(0) No(1)
• ans is 45
  t=90/(10+5)=9
  d=5X9=45
  
• 8 years agoHelpfull: Yes(0) No(2)