alleryএখন গাড়ীৰ দ্ৰুতি 5 km/h বৃদ্ধি কৰিলে ই এটা 60 km পথ 1 hour সোনকালে শেষ কৰিব পাৰে। ইয়াৰ প্ৰকৃত দ্ৰুতি কিমান আছিল?
A12 km/h
B15 km/h
C10 km/h
D20 km/h
Answer & Solution
Correct answer: B. 15 km/h
60/s - 60/(s+5) = 1-ৰ পৰা পোৱা যায় s(s+5) = 300, গতিকে s = 15 km/h।
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