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?

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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) About Me  (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

2%2F%281%2F20%2B1%2F10%29-------simplify and compute this.