Posted by Sara on Thursday, May 17, 2012 at 6:24pm.
1) Matt traveled the first leg of his trip for 1350 miles on a large jet. He then traveled an additional 600 miles on a private plane to reach his destination. If the speed of the jet was three times the speed of the plane and the total time in the air was 6 hours determine the speed of each aircraft.
2) Matt and Sara mow lawns together. When Matt mows the lawn for Mr. Smith it takes 100 minutes. When matt and Sara work together to mow the lawn for Smith they get the job done in 40 minutes. How long will it take Sara to mow Smith's lawn by herself?

Math  Reiny, Thursday, May 17, 2012 at 6:45pm
speed of private plane  x mph
speed of jet > 3x mph
time for 1st leg of trip = 1350/x
time for 2nd leg of trip = 600/(3x) = 200/x
so 1350/x + 200/x = 6
1550/x=6
6x = 1550
x = 258.333..
private plane went 258.33 mph, jet went 775 mph

Math  Reiny, Thursday, May 17, 2012 at 6:50pm
Matt's rate = lawn/100
Sara's rate = lawn/x , where x is Sara's time if she works alone
combined rate = lawn/100 + lawn/x
= (xlawn + 100lawn)/(100x)
= lawn*(x+100)/(100x)
then lawn*(x+100)/(100x) = lawn/40
(x+100)/(100x) = 1/40
crossmultiply
100x = 40x + 4000
60x = 4000
x = 66.666. or 66 2/3 minutes
Answer This Question
Related Questions
 Math  Elenore made an 850 mile trip east. She traveled 2 hours by jet and 30 ...
 math  jenny had driven for 2h at a constant speed when road forced to reduce ...
 algebra  a two part canoe trip,the first part of the trip the canoist traveled ...
 trig  A plane climbs into the jet stream which is flowing at a rate of 80 miles...
 trig  jet stream which is flowing at a rate of 80 miles per hour. It travels ...
 Math  An airplane flies 500 mi/h in still air. Flying with the jet stream, the ...
 Physics  To reach city A, you travel north for 2.00 hours covering 80.0 miles. ...
 algebra  Family on a road trip. travels x miles on day 1. On day 2 they go 52 ...
 algebra  A private plane leaves an airport and flies due east at 192 miles per ...
 math  mr.musial traveled by car to a destination that is 1150 miles from ...
More Related Questions