At what time will B catch up with A. If A starts from a place at 11.00 A.M. and travels at a speed of 3.5 kmph, B starts at 1.00 P.M. and travels with speeds of 1 kmph for 1 hour, 2 kmph for the next 1 hour, 3 kmph for the next 1 hour and so on.

• Time Distance of A Distance of B
  11-12 4 0
  12-1 8 0
  1-2 12 1
  2-3 16 3
  3-4 20 6
  4-5 24 10
  5-6 28 15
  6-7 32 21
  7-8 36 28
  8-9 40 36
  Now at 9 am, A is traveling @ 4 km/hr and B @ 9 km/hr , so a relative speed of 5 km/hr with 4 km distance between them. it would take 4km/ 5km/hr == 0.8 hr == 48 minutes so answer is 9.48
• 11 years agoHelpfull: Yes(27) No(5)
• At 1300 hrs ... Distance between A and B= 2*3.5 = 7 kms
  at 1400 hrs .....Distance between A and B= 7+3.5-1= 9.5 kms
  At 1500 hrs ....Distance between A and B= 9.5 + 3.5-2= 11 kms.
  ...
  ..
  ..
  At 2000 hrs (8PM) distance between A and B = 3.5 kms.
  From 8PM to 9 PM, speed of A =3.5 kmph
  speed of B= 8 kmph
  relative speed = 4.5 kmph
  
  Time taken by B to meet A = 3.5/4.5 hrs = 7/9 hrs = 140/3 mins= 47 mins
  
  so meeting time is 8:47 PM
• 12 years agoHelpfull: Yes(14) No(8)
• at 8:47 PM , B will catch A.
• 12 years agoHelpfull: Yes(4) No(5)
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• 12 years agoHelpfull: Yes(2) No(3)
• at 5'O clock B can catch the A
• 11 years agoHelpfull: Yes(1) No(4)
• how to come 4 in 11-12 4 0
• 10 years agoHelpfull: Yes(0) No(0)