SOLUTION: Ramesh goes from station A to station B at the speed of 40 km/hr and returns from station B to station A at the speed of 60 km/hr. Find his average speed for the whole journey.

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Question 1042093: Ramesh goes from station A to station B at the speed of 40 km/hr and returns from station B to station A at the speed of 60 km/hr. Find his average speed for the whole journey.
Answer by stanbon(75887) About Me  (Show Source):
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Ramesh goes from station A to station B at the speed of 40 km/hr and returns from station B to station A at the speed of 60 km/hr. Find his average speed for the whole journey.
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Let distance from A to B be "x" km
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Time from A to B = x/40 hr
Time from B to A = x/60 hr
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Average speed = (total distance)/(total time)
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= (2x)/(x/40 + x/60)
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= (2x)/[(60x + 40x)/40*60]
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= (2x)/[100x/2400]
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= 2*2400/100
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= 48 kmh
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Cheers,
Stan H.
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