1 . If a man swims 4 miters upstream at 1 mph and back downstream to the same point at 4 mph, what is his average speed?
- A. 0.8 mph
- B. 1.6 mph
- C. 2.4 mph
- D. 3.2 mph
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২৮ তম বিসিএস প্রিলিমিনারি টেস্ট (28-11-2008)
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