Solve of the problem - 35

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Uploaded: 19.12.2015
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Product description


Dva poezda dvizhutsia navstrechu drug drugu so skorostiami 72 i 54 km/ch. Passazhir, nakhodiashchiisia v pervom poezde, zamechaet, chto vtoroi poezd prokhodit mimo nego v techenie 14 s. Kakova dlina vtorogo poezda

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