A person travels from X to Y at a speed of 40 kmph and returns by increasing his speed by 50%. What

$x to y= 40km/h$
$y \: to\: x = 40*\left ( \frac{150}{100} \right ) = 60km/h$
$Avg. Speed = \frac{\left (10*60*2 \right )}{\left ( 40+60 \right )}= 48km/h$

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