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CBSE Class 11-science Answered

A car Travels a distance from A to B at a speed of 40 kilometre per hour and returns to a speed of 30 kilometre per hour what is the average speed for the whole journey
Asked by Somashekar308 | 28 Aug, 2019, 09:45: PM
answered-by-expert Expert Answer
Let distance between A and B = x km
 
Time taken to travel from A to B = ( x/40 ) hr
Time taken to travel from B to A = ( x/30 ) hr 
 
total time of journey = (x/40) + (x/30)   = (7/120) x hr
 
total distance travelled  = 2x  km
 
average speed = (total distance)/(total time) = 2x / [ (7/120) x ]  = ( 240/7 ) km/hr ≈ 34.3 km/hr
Answered by Thiyagarajan K | 28 Aug, 2019, 10:11: PM
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