Question

If a train start from point A and reach to point B at speed 30km/h. same train return back from point B to A at speed 50km/h.Find average speed.

Answer 1

average speed= 30km+50km/2hrs

average speed = 80km/2hrs

average speed= 40km/hr

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Answer 2

Hey Men !!!

Let velocity form A to B = v ( 30Kmph )
Let velocity from B to A = v' ( 50 Kmph )

So,

$avg \: speed = \frac{2(v)(v)}{v + v} \\ \\ = > \frac{2(30)(50)}{30 + 50} \\ \\ = > \frac{3000}{80} \\ \\ = > 37.5 \: kmph$

So,

The Average speed of Train = 37.5 Kmph