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

Algebra ->  Polynomials-and-rational-expressions -> 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      Log On


   

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) About Me  (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

%282%261%2F2%29r=2%28r%2B20%29---------solve this equation.