alleryএকই 180 m দৈর্ঘ্যের ট্রেন 54 km/h গতিবেগে বিপরীত দিক থেকে 18 km/h গতিবেগে তার দিকে ছুটে আসা একজন প্রাতঃভ্রমণকারীর মুখোমুখি হয়। তাকে অতিক্রম করতে কত সময় লাগবে?
A12 seconds
B10 seconds
C8 seconds
D9 seconds
Answer & Solution
Correct answer: D. 9 seconds
আপেক্ষিক গতিবেগ 72 km/h = 20 m/s, সুতরাং 180 / 20 = 9 seconds।
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