alleryনাও এখনৰ স্থিৰ পানীৰ গতি ঘণ্টাত 12 কিলোমিটাৰ। ই নদীৰ সোঁতৰ সৈতে 30 কিলোমিটাৰ আৰু নদীৰ সোঁতৰ বিপৰীতে 18 কিলোমিটাৰ যাত্ৰা কৰে। মুঠ যাত্ৰাৰ সময় 4 ঘন্টা। ধনাত্মক প্ৰবাহৰ গতি বিচাৰক।
A3 km/h
B2 km/h
C1 km/h
D4 km/h
Answer & Solution
Correct answer: A. 3 km/h
ষ্ট্ৰিমৰ গতি x ৰ বাবে 30/(12+x) + 18/(12−x) = 4 লৈ হ্ৰাস পায়
x(x−3)=0;
ধনাত্মক সমাধান হ’ল 3 km/h।
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