A problem by Reduan Rafi

Level pending

Tow train from two different cities started journey .The 1st train having speed with 30kmp/h and 2nd with 20 kmp/h.A bird also started journey from the second city with a speed of 50 kmp/h . Before tow train cross each other the bird have made several cycle from 1st train to 2nd train . Now calculate how much distance the bird have passed .

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