alleryসোঁতৰ অনুকূলে দ্ৰুতি 18 km/h আৰু সোঁতৰ প্ৰতিকূলে দ্ৰুতি 10 km/h হ'লে নদীৰ সোঁতৰ গতি কিমান?
A2 km/h
B8 km/h
C14 km/h
D4 km/h
Answer & Solution
Correct answer: D. 4 km/h
সোঁতৰ দ্ৰুতি হ'ল পাৰ্থক্যৰ আধা, (18 - 10) / 2 = 4 km/h।
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