Mathematics · Speed, Time and Distance
एक ट्रेन 12 सेकंड में एक खंभे को पार करती है और 28 सेकंड में 240 मीटर लंबे प्लेटफॉर्म को पार करती है। यदि ट्रेन [x + 20] मीटर लंबे एक अन्य प्लेटफॉर्म को 15 सेकंड में पार करती है, तो x का मान ज्ञात कीजिए।
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