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If distance left is (D(t)=120-15t) km, how much distance will be left at (t=4)?यदि दूरी (D(t)=120-15t) किमी बचती है, तो (t=4) पर दूरी कितनी बचेगी?
Answer and explanationउत्तर और व्याख्या
Correct answer:सही उत्तर: 60 km60 km
Given \(D(t)=120-15t\). Substituting \(t=4\), \(D(4)=120-15\times4=120-60=60\) km. Hence, 60 km of distance is left after 4 time units. The value 75 km would result from using \(t=3\), not \(t=4\). Exam tip: Substitute the given value of \(t\) in every term of the linear expression carefully.दिया है: \(D(t)=120-15t\)। \(t=4\) रखने पर \(D(4)=120-15\times4=120-60=60\) km। इसलिए 4 समय-इकाइयों के बाद 60 km दूरी बचेगी। 75 km तब मिलता यदि \(t=3\) रखा जाता। परीक्षा टिप: रैखिक व्यंजक में दिए गए \(t\) के मान को हर जगह सावधानी से प्रतिस्थापित करें।
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