CBSE Class 9 Answered
A car travels 30km at a uniform speed of 40km/h and the next 30km at a uniform speed of 30km/h. Find its average speed.
Asked by vishwakarmabrijesh29 | 16 Apr, 2019, 08:07: PM
Expert Answer
Time taken to cover first 30 km = 30/40 = 3/4 = 0.75hr
Time taken to cover next 30 km = 30/30 = 1 hr
As we know average speed = total distance/total time
So avg speed = 60/(1+0.75) = 60/1.75 = 34.29 km/hr
Answered by Ankit K | 16 Apr, 2019, 11:04: PM
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