ICSE Class 9 Answered
a car travels 100km at a speed of 60km/h and returns at a speed of 40km/h calulate the average speed for the whole journey
Asked by navyaindu48 | 21 Sep, 2023, 19:57: PM
Given that,
Total Distance travelled, 2d = 2× 100 =200 km
Initial Speed, u1 = 60 km/hr
Final Speed, u2 = 40 km/hr
Now,
The average speed,
![v subscript a v g end subscript equals fraction numerator t o t a l space d i s t a n c e over denominator T o t a l space t i m e end fraction
v subscript a v g end subscript equals fraction numerator 200 over denominator left parenthesis 100 divided by 60 plus 100 divided by 40 right parenthesis end fraction equals fraction numerator 200 over denominator begin display style fraction numerator 40 plus 60 over denominator 24 end fraction end style end fraction
therefore v subscript a v g end subscript equals 48 space k m divided by h r space space](https://images.topperlearning.com/topper/tinymce/cache/9732a48eece20599b96582959aaba2f2.png)
Answered by Jayesh Sah | 22 Sep, 2023, 19:34: PM
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