SOLUTION: The total travel time for a family to reach a campsite is 2 hours. They drove for 81 kilometer and hiked for 2 kilometer. If they drove 50 kilometer per hour faster than they hiked

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Question 1071915: The total travel time for a family to reach a campsite is 2 hours. They drove for 81 kilometer and hiked for 2 kilometer. If they drove 50 kilometer per hour faster than they hiked, what is their average driving speed?
Found 2 solutions by josgarithmetic, ikleyn:
Answer by josgarithmetic(39620)   (Show Source): You can put this solution on YOUR website!
                SPEED        TIME       DISTANCE
Driving          r                     81
hiking          r+50                2
Total                        2           83

Find average driving speed using equation .
Answer by ikleyn(52798)   (Show Source): You can put this solution on YOUR website!
.
The total travel time for a family to reach a campsite is 2 hours. They drove for 81 kilometer and hiked for 2 kilometer.
If they drove 50 kilometer per hour faster than they hiked, what is their average driving speed?
~~~~~~~~~~~~~~~~~~~~~~~~

= 2.

Solve for "r". For it, multiply both sides by r*(r-50), then simplify and solve the quadratic equation which you obtain.



Post by "josgarithmetic" is WRONG.




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