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 ?
October 17, 2016 | গাণিতিক যুক্তি, , 28 BCS Preliminary
| - 0.8 mph
- 1.6 mph
- 2.4 mph
- 3.2 mph
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