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A train travels from a station B to station C using path P,

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A train travels from a station B to station C using path P, [#permalink] New post 17 Jan 2007, 13:45
A train travels from a station B to station C using path P, while it returns using a different path. If the average speed on path P is 60km/hr, what is the average speed for the round trip?
1) The average speed on the back trip is 2/3 of the average speed on path P
2) The path P is 1/3 times longer than that of the back route.
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 [#permalink] New post 18 Jan 2007, 20:36
Avg speed =total dist d/total time t

speed s of p=60

S1:s of back trip b=2/3 of p=40
since we can't find t and d - insuff

S2:d of p=4x/3 where x = d of b
t of p=d/s=(4x/3)/60=x/45
since we do not any other details about b - inuff

Together:
t of b=x/40
total d=x+(4x/3)=7x/3
total t=(x/40)+(x/45)
Since we can calculate total t and total d - suff

My ans is C
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 [#permalink] New post 20 Jan 2007, 08:58
C .. agree with sumithra
  [#permalink] 20 Jan 2007, 08:58
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