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Suppose-you-are-in-a-imagnary-train-which-travels-at-the-half-of-the-speed-of-light-Suppose-You-have-a-brother-who-is-7-year-smaller-than-you-He-stands-on-the-platform-which-you-had-left-After-1-h




Question Number 120132 by Dwaipayan Shikari last updated on 29/Oct/20
Suppose you are in a imagnary train which travels at the half   of the speed of light. Suppose You have a brother who is 7 year  smaller than you. He stands on the platform which you had left.  After 1 hour of travelling on the train you come back on the  platform. Then you observe something strange. You can see  your brother looks older . So what is his age?(He was ten years  old)
$${Suppose}\:{you}\:{are}\:{in}\:{a}\:{imagnary}\:{train}\:{which}\:{travels}\:{at}\:{the}\:{half}\: \\ $$$${of}\:{the}\:{speed}\:{of}\:{light}.\:{Suppose}\:{You}\:{have}\:{a}\:{brother}\:{who}\:{is}\:\mathrm{7}\:{year} \\ $$$${smaller}\:{than}\:{you}.\:{He}\:{stands}\:{on}\:{the}\:{platform}\:{which}\:{you}\:{had}\:{left}. \\ $$$${After}\:\mathrm{1}\:{hour}\:{of}\:{travelling}\:{on}\:{the}\:{train}\:{you}\:{come}\:{back}\:{on}\:{the} \\ $$$${platform}.\:{Then}\:{you}\:{observe}\:{something}\:{strange}.\:{You}\:{can}\:{see} \\ $$$${your}\:{brother}\:{looks}\:{older}\:.\:{So}\:{what}\:{is}\:{his}\:{age}?\left({He}\:{was}\:{ten}\:{years}\right. \\ $$$$\left.{old}\right) \\ $$

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