दो साइकिल सवार एक ही स्थान से विपरीत दिशाओं में क्रमश:17 किलोमीटर प्रति घंटा तथा 20 किलोमीटर प्रति घंटा की चाल से जाते हैं कितनी देर बाद उनके बीच का फैसला 95 किलोमीटर होगा
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