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?
Algebra.Com
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
RELATED QUESTIONS
Traveling down stream a boat went 15 mph traveling upstream the boat only went 4 mph find (answered by ewatrrr)
The current in a stream moves at a speed of 4 mph. A boat travels 5 mi upstream and 13 mi (answered by scott8148)
Please help!
1.) A blimp that usually goes y mph in still air, when a 10... (answered by ankor@dixie-net.com)
The current in a stream moves at a speed
of 4 mph. A boat travels 5 mi upstream and 13... (answered by josmiceli)
the current in a stream moves at a speed of 9 mph. a boat travels 4 mi upstream and 4 mi... (answered by TimothyLamb,josgarithmetic,MathTherapy)
The current in a stream moves at a speed
of 4 mph. A boat travels 5 mi upstream and 13... (answered by stanbon)
Tacee rode her bike for 1 3/4 hours at 12 mph then slowed down to 8 mph for 1 1/2 hours.... (answered by josgarithmetic)
A round trip in a helicopter lasted 4 and 1/2 hours. If it flew away from the airport at... (answered by ankor@dixie-net.com)
On a 100-mile trip,a family drove for 1 hour at 50 mph and then the rest at 60 mph. What... (answered by stanbon)