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A train travels from a station B to station C using path P, [#permalink]
17 Jan 2007, 12:45
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.