A person covers half of the total distance at the speed of 40 km per hour, half of the remaining at 20 km per hour and the rest at 10 km per hour. Find the average speed during the journey.
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e total distance be 2x km.
Then,
Time taken =
6
x
+
3
x
=
6
3x
=
2
x
hours
∴Average speed=
time taken
Total distance
=
2
x
2x
km/hr
=4km/hr.
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