Answered

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A motorboat travels 200 miles in 5 hours going upstream. It travels 260 miles going downstream in the same amount of time. What is the rate of the boat in still water and what is the rate of the current?

Sagot :

B= Speed of the boat in the water =46 miles per hour

A= Speed of the Current =6 miles per hour

Speed upstream: B-A

Speed Downstream: B+A

Distance= Speed x time

Upstream :

(B-A) 5 = 200

Downstream:

(B+a) 5 = 260

Simplify both equations:

5B-5A =200

5B+5A =260

Add both equations:

10B = 460

Solve for B

B= 460/10

B= 46 miles/hour

Replace B on any distance equation:

5B-5A =200

5(46)-5A=200

Solve for A

230-5A=200

230-200=5A

30=5A

30/5 =A

A= 6 miles/hour

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