At 12:00 hours jake starts to walk from his house at 6kms an hour. At 13:30 hours, paul follows him from jake's house on his bicycle at 8 kmph. When will jake be 3 kms behind paul?

• upto 13:30 jake covered 6*1.5=9km
  then paul need to be ahead of 3 km.so he go 12km.
  their relative speed is 2km per hour.(same direction).
  so 12km divided by 2 is 6hrs.
  hence from 13:30hrs ,6hrs is added.so answer is 19:30 hours.
  ANS:19:30 hrs
• 11 years agoHelpfull: Yes(105) No(6)
• 8t-6(t+1.5)=3
  t=6hour
  at 19.30(13.30+6)hours
  
• 11 years agoHelpfull: Yes(37) No(5)
• at 13.30 jake - 9km ---- paul - 0km
  @14.30 jake- 15km ---- paul - 8km
  @15.30 jake- 21km ---- paul - 16km
  @16.30 jake- 27km ---- paul - 24km
  @17.30 jake- 33km ---- paul - 32km
  @18.30 jake- 39km ---- paul - 40km
  @19.30 jake- 45km ---- paul - 48km
  
  or another method is by relative speed
  their relative speed is 2km per hour.(same direction).
  so 12km divided by 2 is 6hrs.
  hence from 13:30hrs ,6hrs is added.so answer is 19:30 hours.
  ANS:19:30 hrs
  
• 9 years agoHelpfull: Yes(18) No(0)
• ans is 19:30
• 11 years agoHelpfull: Yes(17) No(5)
• at 16:30 hours
• 11 years agoHelpfull: Yes(9) No(23)
• 16:30
  since jake start at12:00 wd the speed 6 at t13:30 we will be 9 km away. now paul follows him at 13:30 with speed of 8.. so with each one hour increase the b?w will decrease by 2. so no of hours reqd to make the gap 3 is (9-3)/2 ( distance/ relative speed) which is equal to 3. so 13:30+3:00=16:30 is the ans
  
  
• 11 years agoHelpfull: Yes(8) No(14)
• 19:30
  its the right ans
• 11 years agoHelpfull: Yes(7) No(1)
• let they will meet after t hrs.
  then distance travelled by paul in (t-1.5)hrs-distance travelled by jake in t hrs=3
  (t-1.5)*8-t*6=3
  or t=7.5
  thus they willmeet after 7.5 hrs
  i,e: at 19:30hrs
• 11 years agoHelpfull: Yes(4) No(2)
• 17:30 jake will be 3 km behind paul
• 11 years agoHelpfull: Yes(2) No(10)
• Hello here the difference 13:30 and for 12.00 is 1.30 then how will u take it as 1.5hrs, its damn confusing, boss give the correct answer.
• 9 years agoHelpfull: Yes(2) No(1)
• 8t+6(t+1.5)
  how 1.5 has come in above equation
  
• 8 years agoHelpfull: Yes(1) No(1)
• ans is 19.00. Can anyone please explain by formula?
• 11 years agoHelpfull: Yes(0) No(9)
• ans is 18.30
• 11 years agoHelpfull: Yes(0) No(9)
• 16:30 hours
• 11 years agoHelpfull: Yes(0) No(3)
• i think at any point sum of distance will be same..
  
• 11 years agoHelpfull: Yes(0) No(1)