alleryএকটি যানবাহন একটি 10 km রাস্তার দুই-পঞ্চমাংশ 20 km/h গতিবেগে এবং বাকি অংশ 30 km/h গতিবেগে অতিক্রম করে। গড় গতিবেগ কত?
A25 km/h
B26 km/h
C28 km/h
D24 km/h
Answer & Solution
Correct answer: A. 25 km/h
20 গতিবেগে 4 km যেতে 0.2 h সময় লাগে এবং 30 গতিবেগে 6 km যেতে 0.2 h সময় লাগে, সুতরাং 0.4 h সময়ে 10 km মানে 25 km/h।
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