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BaLLatris [955]
3 years ago
10

A regular

Mathematics
1 answer:
vivado [14]3 years ago
3 0
The correct answer is The letter b
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Determine the average speed of the current in a river if a boat moves at 20 miles/hour in still water and takes 3 hours to trave
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<em><u>Solution:</u></em>

Given that,

Speed of boat in still water = 20 miles per hour

Time taken = 3 hours

Distance downstream = 78 miles

To find: Speed of current

<em><u>If the speed of a boat in still water is u km/hr and the speed of the stream is v km/hr, then:  </u></em>

Speed downstream = (u + v) km/hr

Speed upstream = (u - v) km/hr

<em><u>Therefore, speed downstream is given as:</u></em>

\text{ speed downstream } = \frac{distance}{time} = \frac{78}{3}\\\\\text{ speed downstream } = 26 \text{ miles per hour }

We know that,

Speed downstream = (u + v)

26 = 20 + v

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3 years ago
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