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Wolfb21345
29.01.2021 •
Mathematics
Select the TWO statements that show correct reasoning for finding 15 : 2 9 o A Multiply 15 by 2, then divide by 9. B. Multiply 15 by 9, then divide by 2 O C Multiply 15 by then multiply by 2 1 OD Multiply 15 by 9, then multiply by 2
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Ответ:
He should row at the speed of 12 kilometers per hour.
Step-by-step explanation:
Given:
An athlete plans to row upstream a distance of 6 kilometers and then return to his starting point in a total time of 4 hours.
The rate of current is 2 km/hr.
Now, to find how fast should he row.
Let speed of the athlete row be
.
Distance = 6 kilometres.
So, to get the time of upstream:
Rate of upstream =
.
Time of upstream =![\frac{x-2}{6}](/tpl/images/0421/6828/724c7.png)
Now, to get the time of downstream:
Rate of upstream=![x+2](/tpl/images/0421/6828/40ea4.png)
Time of downstream =
.
Now, as given total time 4 hours.
Thus, we set an equation:
Time of upstream + time of downstream = total time.
Multiplying both sides by 6 we get:
Dividing both sides by 2 we get:
Therefore, he should row at the speed of 12 kilometers per hour.