নৌকা ও স্রোতের বেগ ঘন্টায় যথাক্রমে ১০ ও ২ কিমি। স্রোতের বিপরীতে ৩৬ কিমি পথ অতিক্রম করতে ??ত সময় লাগবে?
A. ৩ ঘন্টা
B. ৪.৫ ঘন্টা
C. ৭.৫ ঘন্টা
D. ৬ ঘন্টা
সঠিক উত্তরঃ
B.
৪.৫ ঘন্টা
Explanation:
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