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একটি গাড়ি $4$ ঘণ্টায় $360$ km দূরত্ব অতিক্রম করে। গাড়িটির গড় গতিবেগ নির্ণয় করুন।

A$60$ km/hr
B$80$ km/hr
C$90$ km/hr
D$100$ km/hr
Answer & Solution
Correct answer: C. $90$ km/hr
গতিবেগ $= \dfrac{\text{দূরত্ব}}{\text{সময়}} = \dfrac{360}{4} = 90$ km/hr।
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If the ratio of the speeds of A and B is $3 : 4$, what is the ratio of the times they takeA man travels the first half of a journey at $30$ km/hr and the second half at $60$ km/hr.Convert a speed of $90$ km/hr into metres per second.