If a body covers 1/3rd distance at 10 kmph 2/3rd at 20 kmph and 3/3rd distance at 60 kmph. find average speed.
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Average speed = Total distance / Total time
They are being sneaky by giving you total time - You don’t need it.
Pick an arbitrary distance and use that for each of the speeds to find out the 3 times to do that distance.
Average speed then equals 3 x arbitrary distance / Sum of your 3 times.
Sanity check - Your answer should be between 10 km/h and 20 km/h.
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