- #1

yorick

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**[SOLVED] Average speed with an unknown distance**

You travel from Place A to Place B, half the time at a speed of 60km/h and the other half at 100km/h. On the return journey, you travel half the

*distance*at 60km/h, and the other half at 100km/h.

a) What is your average speed from A to B?

b) What is your average speed from B to A (return journey)?

c) What is your average speed for the entire trip?

a) [tex]\overline{Sp}[/tex] = (60 + 100)/2 = 80km/h... Easy enough.

b&c)

I just don't know where to start with this.

I tried a displacement vs. time graph but without any actual values for the displacement I didn't know what to do.

I'm not necessarily after an answer for this, but a nudge in the right direction would be greatly appreciated.

Thanks,

Yorick.