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Joshghopper
10.02.2020 •
Physics
Bob swam 4 kilometers against the current in the same amount of time it took him to swim 12 kilometers with the current. The rate of the current was 2 kilometers per hour. How fast would Bob swim if there were no current?
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Ответ:
Speed of the bob when there is no current is 4 km/hr
Explanation:
Let the Bob swam v km/hr without the current '
Speed of current is 2 km/hr
So speed in the direct of current = v+2 km/hr
And speed against the direction of current = v-2 km/hr
It is given that Bob swam 4 km against the current in the same time as swam 12 km in direct of current , means time is same
We know that time![=\frac{distance}{speed}](/tpl/images/0505/3995/9a24f.png)
So![\frac{4}{v-2}=\frac{12}{v+2}](/tpl/images/0505/3995/6662d.png)
8 v = 32
v = 4 km/hr
So speed of the bob when there is no current is 4 km/hr
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