How is Average Speed Calculated for a Two-Part Journey?

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Homework Help Overview

The discussion revolves around calculating the average speed for a two-part journey involving a car traveling different distances at varying speeds. The original poster presents a problem involving specific distances and speeds, seeking to determine the overall average speed for the entire journey.

Discussion Character

  • Exploratory, Mathematical reasoning

Approaches and Questions Raised

  • The original poster attempts to calculate the average speed by determining the time taken for each segment of the journey and then applying the average speed formula. Some participants affirm the calculations presented, indicating agreement with the approach taken.

Discussion Status

The discussion appears to be in a confirming phase, with multiple participants expressing agreement with the original poster's calculations. However, there is no exploration of alternative methods or deeper questioning of the assumptions involved in the average speed calculation.

Contextual Notes

No additional constraints or assumptions are noted in the discussion, and all participants seem to accept the parameters set by the original poster.

chawki
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Homework Statement


A car is driven 19 km at an average speed of 91 km/h and after that 61 km at an
average speed of 65 km/h.

Homework Equations


What was the average speed of the whoIe joumey?

The Attempt at a Solution


t1=19/91 = 0.208 h
t2=61/65 = 0.938 h

average speed = (19+61)/(0.208+0.938)
average speed = 69.808 km/h
 
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This looks fine.
 
looks ok! :smile:
 
its correct!
 

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