SOLUTION: I haven't done too bad with the word problems but this one has stumped me:
The typical cruising speed for a Boeing 747-400 airplane is 30 mph faster than that for a Boeing 737-8
Algebra ->
Customizable Word Problem Solvers
-> Travel
-> SOLUTION: I haven't done too bad with the word problems but this one has stumped me:
The typical cruising speed for a Boeing 747-400 airplane is 30 mph faster than that for a Boeing 737-8
Log On
Question 67165This question is from textbook Intermediate Algebra with Applications
: I haven't done too bad with the word problems but this one has stumped me:
The typical cruising speed for a Boeing 747-400 airplane is 30 mph faster than that for a Boeing 737-800. If a Boeing 747-400 can make a trip of 1680 mi in 3 h, how long would it take a Boeing 737-800 to make the same trip? Round to the nearest tenth.
I know the equation to work with is rate x time = distance and have made a table solving for 30r x 3 = 1680. I have gotten r = 18.67 mph which I checked with the equation for the Boeing 747-400. When I try to take 18.67 x t = 1680 I'm getting 89.98 which is completely different from the answer in the book. I need to know how to set up the rest of the problem to solve for the correct answer. This question is from textbook Intermediate Algebra with Applications
You can put this solution on YOUR website! The typical cruising speed for a Boeing 747-400 airplane is 30 mph faster than that for a Boeing 737-800. If a Boeing 747-400 can make a trip of 1680 mi in 3 h, how long would it take a Boeing 737-800 to make the same trip? Round to the nearest tenth.
I know the equation to work with is rate x time = distance and have made a table solving for 30r x 3 = 1680. I have gotten r = 18.67 mph which I checked with the equation for the Boeing 747-400. When I try to take 18.67 x t = 1680 I'm getting 89.98 which is completely different from the answer in the book. I need to know how to set up the rest of the problem to solve for the correct answer.
:
Let s = the speed of the 737; then (s+30) = the speed of the 747
:
Find the value of s and divide that into 1680, to get the time of the 737:
3(s+30) = 1680
(