allery54 km/h গতিত যোৱা 180 m দৈৰ্ঘ্যৰ এখন ৰে'লে একে দিশতে 18 km/h গতিত দৌৰি থকা এজন দৌৰবিদক অতিক্ৰম কৰে। দৌৰবিদজনক পাৰ হ'বলৈ কিমান সময় লাগিব?
A15 seconds
B18 seconds
C12 seconds
D20 seconds
Answer & Solution
Correct answer: B. 18 seconds
আপেক্ষিক দ্ৰুতি 36 km/h = 10 m/s, আৰু 180 / 10 = 18 seconds।
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