Aboat traveled 280 miles each way downstream and back. the trip downstream took 10 hours. the trip back took 20 hours. find the speed of the boat in still water and the speed of the current

Let x mi/h be the speed of the boat in still water and y mi/h be the speed of stream.

1) Downstream.

The speed of the boat travelling downstream is x+y mi/h. Then

2) Upstream.

The speed of the boat travelling upstream is x-y mi/h. Then

3) Solve the system of equations:

Add these two equations:

Subtract these two equations:

the speed of the boat in still water is 21 miles per hour and the speed of the stream is 7 miles per hour.

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answer: c.  

step-by-step explanation:

mixtures containing substances that get attracted to magnet can be separated using a magnet. we can separate iron from a mixture of sand and iron, as only iron attracts to the magnet.