Concept explainers
To determine the speed of for the second half of the trip.
Answer to Problem 6ST
The speed for the second half should be 120 km/hr.
Explanation of Solution
Given information :
Average speed of train is 80 Km/h for first half.
Average speed for whole journey is 96 Km/h.
Average speed is
Let us take the total distance be
Time taken for first half will be
Time taken for second half shall be
Hence the average speed
Hence we get,
Hence the speed for the second half should be 120 km/hr.
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Algebra and Trigonometry: Structure and Method, Book 2
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