The distance between two piers on a river is 43.2 miles. It takes a motorboat, moving downriver, 2 hr 24 min to complete the journey. How much time does it take the same boat to go back upstream if the current flows at 1.8 mph

Time taken by same boat to go back upstream is 3 hours .

Explanation:

Given :

Current flow , u = 1.8 mph .

Distance between two piers on a river , d = 43.2 miles .

Time taken to move downstream is 2 hr 24 min  i.e

Let , speed of boat be v .

Therefore ,

Now , time taken to go same distance in upstream .

Therefore , time taken by same boat to go back upstream is 3 hours .

Hence , this is the required solution .

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.

close lines strong magnet less close weaker