alleryস্থির জলে 15 km/h গতিবেগের একটি নৌকা স্রোতের অনুকূলে 40 km যায় এবং ফিরে আসে, যেখানে স্রোতের গতিবেগ 5 km/h। মোট সময় কত?
A8 hours
B7 hours
C5 hours
D6 hours
Answer & Solution
Correct answer: D. 6 hours
স্রোতের অনুকূলে 40 / 20 = 2 h এবং স্রোতের প্রতিকূলে 40 / 10 = 4 h, মোট 6 hours।
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