alleryএকটি গাড়ির গতিবেগ 5 km/h বৃদ্ধি করলে সেটি একটি 60 km রুট 1 ঘন্টা আগে সমাপ্ত করতে পারে। এর আসল গতিবেগ কত ছিল?
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 দেয় s(s+5) = 300, সুতরাং s = 15 km/h।
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