Three cities A,B,C are situated are shown in the fig.

A


B C
Given AB= 30 kms , BC= 60 kms and CA= 60 kms
Rahul start from A on his bike, travels to B, from there he goes to C and finally returns to A.
From A to B his average speed was 30 kmph
His average speed for the complete journey is 300/11 kmph
His average speed while travelling from B to C was double his average speed while travelling from C to A.
Q1. Rahul’s average speed during the journey from B toC is…
20 kmph b) 30 kmph c) 40 kmph d) None
Q2. The time that Rahul take to travel from C to A is…….

• from b to c avg spd =2x kmph
  from c to a x kmph
  avg speed fr complete journey =300/11= 150/(1+30/x +60/x)=300/ 1+90/x
  on solving :
  x=20
  thus from b to c avg spd= 60/30 *20 =40kmph
  TIME FROM C TO A IS :
  60/20 = 3hrs
• 10 years agoHelpfull: Yes(16) No(0)
• 1 + 60/2x +60/x =11/2
  b to c speed 2x km/h
  c to a speed x km/h
  
  ans1 is 40kmph
  ans2 is 20kmph
• 10 years agoHelpfull: Yes(3) No(1)
• ans 34.5 because
  (x + 2x +30)/3 = 300/11
• 10 years agoHelpfull: Yes(3) No(0)
• ans1:40kmph
  ans2:3hrs
• 10 years agoHelpfull: Yes(2) No(0)
• b to c its 20
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• Q1) 40
  Q2) 3hours
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• speed from B to C =40km/hr and speed from c to a =20km/hr
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• can you please explain how 11/2 came?
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