SOLUTION: A tourist was planning a trip by car for travelling at some constant speed for 2.5 hours. However, he found that if he increases the speed by 20 km/h he can cover the same distance

Question 1133090: A tourist was planning a trip by car for travelling at some constant speed for 2.5 hours. However, he found that if he increases the speed by 20 km/h he can cover the same distance in 30 minutes less time than it was planned. What was the planned speed of the tourist, in km/h?
Answer by josgarithmetic(39617) (Show Source): You can put this solution on YOUR website!

            SPEED      TIME         DISTANCE

PLANNED        r        2&1/2          d

FASTER        r+20     2&1/2-1/2       d

            SPEED      TIME         DISTANCE

PLANNED        r        2&1/2          d

FASTER        r+20        2            d

---------solve this equation.
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