SOLUTION: During the first 4 hours of a trip, you average 40MPH. How long must you travel at 60MPH to finish with an overall average speed of 55MPH?
Algebra.Com
Question 51443: During the first 4 hours of a trip, you average 40MPH. How long must you travel at 60MPH to finish with an overall average speed of 55MPH?
Answer by Paul(988) (Show Source): You can put this solution on YOUR website!
let x be the time
EQUATION:
40(4)+60x=55(x+4)
160+60x=55x+220
5x=60
x=12
HEnce, you must travel for 12 hours.
Paul.
RELATED QUESTIONS
you and a friend take turns driving on a 530 mile trip. your friend drives for 4 and half (answered by solver91311)
A truck was able to average only 40 mph for the first 4 hours of a delivery route. How... (answered by Alan3354)
A car leaves Oakland for Las Vegas traveling an average of 40mph. Two hours later, a... (answered by richwmiller)
A great lakes ore carrier must travel at an average speed of 24mph for 9 hours to reach... (answered by ankor@dixie-net.com)
a car traveled from a to b in 6 hours. its average speed for first three hours was 60mph... (answered by rfer)
Terrell drove to the mountains at an average 60mph. His return trip, by the same roads,... (answered by macston,MathTherapy)
A man drives to work at 40mph. He drives home,along the same route, at 60mph. What is his (answered by Alan3354)
locomotive travels on a straight track at a constant speed of 40mph, then reverses... (answered by ikleyn)
During the first 6 hours of a trip, you average 44 mi/h. During the last 4 hours of your... (answered by josmiceli)