there are 2 man one old and one young work in the same office and live in same apartment.
The old man takes 30 minutes to reach office and young man take 20 minutes to reach the office . If old man starts at 10:00 a.m for office and the young man at 10:05 a.m then at what time will they meet?

• 10:15 is correct
  
• 9 years agoHelpfull: Yes(14) No(1)
• let speed of old man=vo
  let speed of young man=vy
  
  vo*30=vy*20
  vo/vy = 2/3.....................(1)
  now let they will meet after t time of 10:00 am
  vo*t = vy*(t+5).........................(2)
  from eq(1) and eq(2) we get
  
  vo*t = 15*vo
  so, t=15 mints
  now we can say that they will meet at 10:15 am
• 9 years agoHelpfull: Yes(13) No(5)
• suppose d is the distance b/w aprtment to office
  speed of old man=s1=d/30
  speed of young man=s2=d/20
  suppose they meet after x min(after 10:00 am)
  so the distance covered by old man in x min and dstnc coverd by young man in x-5 min is equal
  so d/30*x=(x-5)*d/20
  x=15
  so the ans is 15 min
  thy meet at 10:15
  
• 9 years agoHelpfull: Yes(12) No(0)
• i marked 10:15
  though i am not very sure
• 9 years agoHelpfull: Yes(8) No(0)
• let distance is d
  
  speed of old man=2d
  speed of young man=3d
  according to question
  2d(t+5/60)=3d*t
  solving it t=10 min
  so it will be 10:15
• 9 years agoHelpfull: Yes(2) No(0)
• answer:10:15
  ratio of their time taken is 3:2 then
  ratio of their speed is 2:3
  let after t time they will meet then
  2x* t = 3x*(t-5)
  2xt = 3xt -15x
  then t = 15 min
• 8 years agoHelpfull: Yes(2) No(0)
• let us assume the distance from apartment to office be 30 k.m
  so old man takes 30 min to cover 30 k.m young man takes 20 min to cover 30 k.m
  30 min ------------30 k.m 20min ------------------30 k.m
  10 min ------------?(X) 10 min -----------------?(X)
  X=(10/30)*30 = 10 k.m X=(10/20)*30 = 15 k.m
  but we know old man starts 5 min early i.e at 10 am while young man at 10:05 am
  in 5 min old man covers 5 k.m..
  finally 10:15 old man covers 15 k.m
  10;15 young man covers 15 k.m hence they meet each other
• 9 years agoHelpfull: Yes(1) No(0)
• 10:15 is right answer for sure
• 9 years agoHelpfull: Yes(0) No(0)
• any one remembered second star mark question .... there was discussion about toss....4 times...????
  
  
• 9 years agoHelpfull: Yes(0) No(0)
• et d is the speed of shakil
  
  
  when rain runs 2000 m shakil runs =1800-d*1..eq 1;
  when rain runs 1000 m shakil runs=2000-d*6 ...eq 2;
  eq 1/eq 2;
  
  2000/1000=(1800-d*1)/(2000-d*6);
  d=200 m/min;
  time taken by shakil =2000/200=10 min;
  time taken by rain =8 min
• 8 years agoHelpfull: Yes(0) No(1)