The total cost of a teapot and teacups
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Answer:
The rate of the jet in still air is 852 miles per hour. The rate of the wind is 85 miles per hour.
Step-by-step explanation:
Let suppose that jet travels uniformly, that is, at constant speed, the expressions for its travels against the wind and with the wind are, respectively:
Against the wind
With the wind
Where:
- Speed of the jet in still air, measured in miles per hour.
- Speed of wind, measured in miles per hour.
,
- Distances travelled by jet against the wind and with the wind, measured in miles.
,
- Times against the wind and with the wind, measured in hours.
By adding both expressions:
Given that ,
,
and
, the speed of the jet is:
The rate of the jet in still air is 852 miles per hour.
Lastly, the rate of the wind is:
The rate of the wind is 85 miles per hour.