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20+30 =25
2
Total average speed is simply = Total distance/Total time Lets say, D = distance travelled by the car in EACH direction t1 = time spent on onward trip t2 = time spent on return trip Thus, the total distance travelled by the car = D+D= 2D And, by the formula, Speed = Distance/Time S1 = D/t1 => t1 = D/S1 S2 = D/t2 => t2 = D/S2 Total average speed = Total Distance/Total time = 2D/(t1+t2) = 2D/(D/S1+D/S2) = 2S1*S2/(S1+S2) Remember this general formula for a total average speed problems: Total average speed = 2S1*S2/(S1+S2)
So in the question S1 = 20km/hr
&S2 = 30km/hr
So av. speed = 2 x 20 x 30/20+30
= 24km/hr
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Average speed:24Kmph
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