একটি মাঝি স্রোতের প্রতিকূলে ১০ ঘন্টায় ৪০ কি.মি. যায়। স্রোতের অনুকূলে ঐ পথ যেতে তার ৫ ঘন্টা লাগে। স্রোতের বেগ কত?
A. ২ কি.মি.
B. ৪ কি.মি.
C. ৬ কি.মি.
D. ৭.৫ কি.মি.
সঠিক উত্তরঃ
A.
২ কি.মি.
Explanation:
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