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2 answers:
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Answer:
1. Upstream Time: 1 hour (or 60 minutes)
2. Downstream Time: 0.65 hour (or 39 minutes)
Step-by-step explanation:
The time it will take goes by the distance formula:
, where D is the distance, R is the rate (speed), and T is the time.
For Upstream, you are going <em>against</em> the current, so your still water speed slows down. So upstream rate is still water rate - stream rate. So 2.8 - 0.6 = 2.2mph
Time it will take him to swim 2.2 miles, is:
So, 1 hour
For Downstream, you are going <em>with</em> the current, so your still water speed increases. So downstream rate is still water rate + stream rate. So 2.8 + 0.6 = 3.4 mph
Time it will take him to swim 2.2 miles, is:
So, 0.65 hours (or 0.65*60=39 minutes)