A subway train makes six stops of equal length during its 21 km run. The train is actually moving for 20 minutes of the trip. At
most how long can the train remain at each station if the average speed for the trip, including stops, is to be at least 36 km/hr?
1 answer:
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Answer:
:)
Step-by-step explanation:
For simplicity I will substitue for β.
In the first step I used the identity
And I factored out
Then it's just simple algebra to cancel till the 3rd step where we used another identity derived from the Pythagorean Theorem.
That's it!