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?

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

So

8 v = 32

v = 4 km/hr

So speed of the bob when there is no current is 4 km/hr

answer: d. a cme increases the amount of energy in the solar wind

explanation:

coronal mass ejections, also called cmes, are large clouds of plasma and magnetic field that erupt from the sun. only when the cloud is aimed at earth will the cme hit earth and therefore cause impacts. high-speed solar wind streams come from areas on the sun known as coronal holes.