A river boat travels upstream at 6 km/h and returns downstream at 9 km/h. What is the average speed for the round-trip?
A. 7
B. 7.2
C. 7.5
D. 7.8
JUIBA (Unit-E)Set-Fমানসিক দক্ষতা(IQ)গাণিতিক সমস্যাIQ-4 (Topic Practice)JU - ⚡ অনলাইন প্রশ্নব্যাংক দেখুন 💥
সঠিক উত্তরঃ
B.
7.2
Explanation:
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