Concept explainers
Find the time after which the private jet is twice as far from Dallas as the commercial jet.
Answer to Problem 19P
2 hours 37.5 minutes
Explanation of Solution
Given :
A commercial jet can fly from San Francisco to Dallas in 3 h. A private jet can make the same trip in
Calculation:
Let the distance between San Francisco and Dallas = d
Time taken by commercial jet to cover the distance = 3 h
Time taken by private jet to cover the distance =
So,
speed of each plane:
Let the time after which the private jet is twice as far from Dallas as the commercial jet = t
So, we can find the distance of each plane from Dallas :
Distance of commercial plane from Dallas =
Distance of private jet from Dallas =
Given ,
Substitute the values of each and solve for t :
So, the time after which the private jet is twice as far from Dallas as the commercial jet is 2 hours 37.5 minutes.
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