SOLUTION: To get to his parents house John must travel at a speed of 60m/hr on land then use a motor boat whos speed is 20 mi/hr in still water. John goes by land to a dock and then travels

Algebra ->  Polynomials-and-rational-expressions -> SOLUTION: To get to his parents house John must travel at a speed of 60m/hr on land then use a motor boat whos speed is 20 mi/hr in still water. John goes by land to a dock and then travels       Log On


   

Question 39981: To get to his parents house John must travel at a speed of 60m/hr on land then use a motor boat whos speed is 20 mi/hr in still water. John goes by land to a dock and then travels on a river against a current of 4 mi/hr. He reaches his parents home in 4.5 hrs. The return trip takes him 3.5 hrs. How far does his parents live from his house?
thanx
Answer by Paul(988) About Me  (Show Source):
You can put this solution on YOUR website!
Total time = 4.5+3.5=8 hours
EQUATION:
x%2F60%2Bx%2F%2820-4%29=8
x%2F60%2Bx%2F16=8
960%28x%2F60%29%2B960%28x%2F16%29=960%288%29
16x+60x=7680
76x=7680
x=101 (rounded)
Hence, the distance is 101 miles.
Paul.