A man complete a journey in 10 hours. He travels first half of the journey at the rate of 21 km/hr and second half at the rate of 24 km/hr. Find the total journey in km.
220 km
224 km
230 km
234 km

• 224 kms.
  
  If S is total distance, then
  
  S/42 + S/48 = 10
  
  solving it , we get
  S= 224 kms.
• 12 years agoHelpfull: Yes(8) No(5)
• t=total time=10
  d=distance
  s=speed
  t=d/s
  t1=(d/2)/21;
  t2=(d/2)/24;
  t1=d/42, t2=d/48;
  t=t1+t2;//t=d/s
  
  10=(d/42+d/48) take LCM
  then
  10=(8d+7d)/336
  d=224;
• 12 years agoHelpfull: Yes(8) No(4)
• We know the average speed can be found out using the formula,
  
  Avg speed= (2*a*b)/(a+b)
  where a and b are the two speeds...
  
  here distance= time * average speed.
  =10*2*21*24/45=224km...
  
• 10 years agoHelpfull: Yes(4) No(1)
• ans -224km
  (x/2)/21+(x/2)/24=10
  on solving
  x=224
• 8 years agoHelpfull: Yes(0) No(0)
• t=d/v.
  so,d/21+d/24=t1+t2=10
  d=112
  so, 2d = 2*112=224km
• 5 years agoHelpfull: Yes(0) No(0)