Big Ideas Math Integrated I, 2016
BI
Big Ideas Math Integrated I, 2016 View details
5. Rewriting Equations and Formulas
Continue to next subchapter

Exercise 36 Page 41

Isolate t from the Distance Formula d=rt and write an equation for the total flying time.

1150 miles

Practice makes perfect

To calculate the distance traveled by each flight, we need to use the Distance Formula. It tells us that to find the distance traveled we need to multiply the rate r by the time t. d=rt Let's divide the above formula by r to isolate t. d=rt ⇔ t=d/r Let d be the distance traveled by each flight. The outbound flight averages 460 miles per hour and the return flight averages 500 miles per hour. Let's write an expression for the time taken in each flight.

Outbound Flight Return Flight
d/460 d/500

The total flying time is the sum of the duration of both outbound and return flights. Moreover, we are told that the total flying time is 4.8 hours. 4.8=d/460+d/500 Let's solve the above equation to find the value of d.

4.8=d/460+d/500
4.8=d*500/460*500+d/500
4.8=d*500/460*500+d* 460/500* 460
4.8=500d/230 000+460d/230 000
4.8=500d+460d/230 000
4.8=960d/230 000
4.8* 230 000=960d
4.8* 230 000/960=d
1150=d
d=1150

The distance traveled by each flight is 1150 miles.