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)


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Question Number 120132 by Dwaipayan Shikari last updated on 29/Oct/20

$S u p p o s e y o u a r e i n a i m a g n a r y t r a i n w h i c h t r a v e l s a t t h e h a l f$ $o f t h e s p e e d o f l i g h t . S u p p o s e Y o u h a v e a b r o t h e r w h o i s 7 y e a r$ $s m a l l e r t h a n y o u . H e s t a n d s o n t h e p l a t f o r m w h i c h y o u h a d l e f t .$ $A f t e r 1 h o u r o f t r a v e l l i n g o n t h e t r a i n y o u c o m e b a c k o n t h e$ $p l a t f o r m . T h e n y o u o b s e r v e s o m e t h i n g s t r a n g e . Y o u c a n s e e$ $y o u r b r o t h e r l o o k s o l d e r . S o w h a t i s h i s a g e ? (H e w a s t e n y e a r s$ $o l d)$
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