SOLUTION: A boat went up the stream for 1/4 of the distance at 4 mph, then another 1/4 at 2 mph and the rest at 8 mph. What was her average speed?

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 Click here to see ALL problems on Travel Word Problems Question 203795: A boat went up the stream for 1/4 of the distance at 4 mph, then another 1/4 at 2 mph and the rest at 8 mph. What was her average speed?Answer by RAY100(1637)   (Show Source): You can put this solution on YOUR website!velocity = distance / time,,,,,t= d/v . 1/4 /4 + 1/4 /2 + 1/2 /8 = 1/v avg . .0625 + .125 + .0625 = 1/v . .25 =1/v . v=4 mph . checking,,,let Distance = 16 miles (arbitrary) 4/4 + 4/2 + 8/8 = 4 = 16/4 ,,,,,ok