A car travels 1/3 of the distance at the average speed of 10km/hand anther 1/3 at 20km/h and the remaining at 30 km/h. Find the average speed for the entire journey.
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Let total distance be 'x'
Time taken to travel first 1/3 of distance=(x/3)÷10
=x/30
Time taken to travel 2nd 1/3 of distance=(x/3)÷20
. . . =x/60
Time taken to travel remaining km=(x/3)÷30=x/90
x/30+x/60+x/90=Total time
AVG speed=x÷(x/30+x/60+x/90)
x÷(x/20)=20 km/hr.
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