A goods train and a passenger train are running on parallel tracks in the same direction. The driver of the goods train observes that the passenger train coming from behind overtakes and crosses his train completely in 60 sec. whereas a passenger on the passenger train marks that he crosses the goods train in 40 sec. If the speeds of the trains be in the ratio 1:2. Find the ratio of their lengths. एक माल गाड़ी और एक यात्री ट्रेन उसी दिशा में समानांतर पटरियों पर चल रही है। माल गाड़ी के चालक ने देखा कि यात्री ट्रेन पीछे से आ रही है और पूरी ट्रेन को 60 सेकंड में पूरी तरह से पार कर रही है। जबकि यात्री ट्रेन के एक यात्री को पता चलता है कि वह 40 सेकंड में माल गाड़ी को पार करता है यदि गाड़ियों की गति का अनुपात 1: 2 में हो तो उनकी लंबाई का अनुपात ज्ञात कीजिये।
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