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A boy standing by the side of a railway ...

A boy standing by the side of a railway track finds that an Up train crosses him in 8 seconds and a down train of twice the length of the Up train crosses him in 20 seconds. How long (in seconds) will the two trains take to cross each other?

A

`13 1/3`

B

15

C

20

D

`13 1/3`

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A boy standing by the side of a railway track that an Up train crosses him in 8 seconds and a Down train of twice the length of that of the Up train crosses him in 20 seconds. How long (in seconds) will the two trains take to cross each other? रेलवे ट्रैक के किनारे खड़ा एक लड़का देखता है कि अप-ट्रेन उसे 8 सेकंड में पार कर जाती है जबकि अप-ट्रेन से दोगुनी लंबाई की डाउन ट्रेन को उसे पार करने में 20 सेकंड लगते हैं | दोनों ट्रेनों को एक दूसरे को पार करने में कितना समय ( सेकंड में) लगेगा ?

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