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A particle goes from A to B with a speed...

A particle goes from `A` to `B` with a speed of `40km//h` and `B` to `C` with a speed of `60Km//h`. If `AB = 6BC`, the average speed in `km//h` between `A` and `C` is-
[Hint : Average speed `= ("total distance travelled")/("time taken")]`

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