Mathematics: The ratio of secondary turns to primary turns in a transformer is 37 to 4. how many secondary turns are there if the primary coil has 48 turns?

The ratio of secondary turns to primary turns in

ninaaforever

09.02.2022

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 = x-2. .

Time of upstream = $\frac{x-2}{6}$

Now, to get the time of downstream:

Rate of upstream= x+2

Time of downstream = $\frac{x+2}{6}$ .

Now, as given total time 4 hours.

Thus, we set an equation:

Time of upstream + time of downstream = total time.

$\frac{x-2}{6} +\frac{x+2}{6} =4.$

$\frac{x-2+x+2}{6} =4.$

$\frac{2x}{6} =4.$

Multiplying both sides by 6 we get:

2x =24.

Dividing both sides by 2 we get:

x =12.

Therefore, he should row at the speed of 12 kilometers per hour.

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