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?

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?

[28 th BCS Preliminary : 2008]

1. 0.8 mph

2. 1.6 mph

3. 2.4 mph

4. 3.2 mph

Answer

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