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.

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) (Show Source): You can put this solution on YOUR website!
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.
---------
Let distance from A to B be "x" km
----
Time from A to B = x/40 hr
Time from B to A = x/60 hr
-------
Average speed = (total distance)/(total time)
-------
= (2x)/(x/40 + x/60)
-----
= (2x)/[(60x + 40x)/40*60]
------
= (2x)/[100x/2400]
----
= 2*2400/100
-----
= 48 kmh
----------------
Cheers,
Stan H.
------------

RELATED QUESTIONS
The distance between train station A and train station B is 180 kilometers. Train station (answered by stanbon)

A train traveled the first 1/6 of the distance from station A to station B at an average... (answered by ptaylor)

a train travels from station A to station B at a distance of 200km apart takes 5... (answered by Alan3354)

Train one leaves from station A towards station B at a speed of 50 km/hr . Train two... (answered by richwmiller)

Ok, I hope you can help it's been driving me nuts for a while now. Train leaves at 9 am... (answered by ankor@dixie-net.com)

a train travels with a speed of 60 km/hr from station A to B and then comes back with a... (answered by Alan3354)

A train takes 2 hours to reach station b from station a, and then 3 hours to return from... (answered by ankor@dixie-net.com)

A train takes 2 hours to reach station b from station a, and then 3 hours to return from... (answered by Alan3354)

Alice travels from the train station to the bus depot at a speed of 20 km/hr starting at... (answered by lwsshak3)