SOLUTION: it took Miguel 3.5 hours to drive from city a to city b. on his way back to city a, he increases his speed by 20 km per hour and it took him 3 hours. find the average speed for the

Question 1070839: it took Miguel 3.5 hours to drive from city a to city b. on his way back to city a, he increases his speed by 20 km per hour and it took him 3 hours. find the average speed for the whole journey
Answer by josgarithmetic(39618) (Show Source): You can put this solution on YOUR website!

              SPEED       TIME      DISTANCE
A to B         r          3.5       d=(r)(3.5)
B to A        r+20        3         d=(3)(r+20)
Totals                   6.5       3.5r+3r+60

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WHOLE JOURNEY, average speed:

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