Mathematics · Speed, Time and Distance
d मीटर लंबी ट्रेन P, 300 मीटर लंबे प्लेटफॉर्म को पार करने में उतना ही समय लेती है जितना समय (d + 200) मीटर लंबी ट्रेन Q, 500 मीटर लंबे प्लेटफॉर्म को पार करने में लेती है। यदि उनकी गतियों का अनुपात (ट्रेन P से ट्रेन Q) 5 : 9 है, तो d का मान क्या है?
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