Saturday
December 20, 2014

Homework Help: help,math

Posted by jas20 on Sunday, February 25, 2007 at 5:56pm.

can some set the equation up for me.

Science and medicine. A plane flies 720 mi against a steady 30-mi/h headwind and then returns to the same point with the wind. If the entire trip takes 10 h, what is the plane’s speed in still air?

i thought it was this set up but its not:

(720)/(30)=(x)/(10)



The correct equation that you need to solve is:
720/(V-30) + 720/(V+30) = 10
V-30 is the planes ground speed flying inti the wind, and V+30 is the ground speed with the 30 mph tail wind. What I wrote was the total time required for both trips.

DRAWLS ,
YOU JUST LOST ME....HOW AM I SUPPOST TO SOLVE FOR THIS



720/(V-30) + 720/(V+30) = 10

Get a common denominator of
(v-30)(v+30)

then multiplying both sides by that, then
720(V+30) + 720(V-30)= 10(v-30)(v+30)
then multily out, and solve for v.

During rush hour, Fernando can drive 35 miles using the side roads in the same time that it takes to travel 30 miles on the freeway. If Fernando’s rate on the side roads is 9 mi/h faster than his rate on the freeway, find his rate on the side roads.

Answer this Question

First Name:
School Subject:
Answer:

Related Questions

math 117 - A plane flies 720 mi against a steady 30 mi/h headwind and then ...
math,correction - Problem #3 Science and medicine. Adriana took 2 h longer to ...
Algebra - Rod is a pilot for Crossland Airways. He computes his flight time ...
Pre-Algebra - Question is: What is the algebraic equation to determine when they...
Pre-Algebra - Question is: What is the algebraic equation to determine when they...
physics - A plane flies directly from city A to B, which are separated by 2300mi...
ALGEBRA 1 - A JET FLIES WITH THE WIND AT 1100km/hr and 750 km/hr against the ...
Physics - An airplane flies at 200.0 km/h relative to the air. What is the ...
Mathematics - A pilot flies a plane that averages approximately 210 km/hr. The ...
Trig - A plane flies 1.3 hr at 100mph on a bearing of N40degreesE. It then turns...

Search
Members