SOLUTION: Peter cycled to town at a speed of 20km/hr. he left his bicycle at the repair shop and ran back home at a speed of 10km/hr. what was his average speed for the whole trip?

Question 1073081: Peter cycled to town at a speed of 20km/hr. he left his bicycle at the repair shop and ran back home at a speed of 10km/hr. what was his average speed for the whole trip?
Answer by josgarithmetic(39618) (Show Source): You can put this solution on YOUR website!

          SPEED     TIME       DISTANCE

CYCLE       20       d/20         d

RAN         10       d/10         d

TOTAL              d(1/20+1/10)   2d

Average speed for round trip:
Distance divided by time

-------simplify and compute this.
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