alleryএকটি ছেলে 5 km/h গতিবেগে হেঁটে 6 মিনিট দেরিতে পৌঁছায়, কিন্তু 6 km/h গতিবেগে সে 6 মিনিট আগে পৌঁছায়। তার গন্তব্য কত দূরে?
A4 km
B6 km
C8 km
D5 km
Answer & Solution
Correct answer: B. 6 km
d/5 - d/6 = 12 min = 0.2 h দেয় d/30 = 0.2, সুতরাং d = 6 km।
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