allery30 km/h গতিবেগে একজন শিক্ষার্থী 5 মিনিট দেরিতে স্কুলে পৌঁছায় এবং 40 km/h গতিবেগে 5 মিনিট আগে পৌঁছায়। স্কুলটি কত দূরে?
A20 km
B25 km
C24 km
D18 km
Answer & Solution
Correct answer: A. 20 km
d/30 - d/40 = 10 min = 1/6 h দেয় d/120 = 1/6, সুতরাং d = 20 km।
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