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) About Me  (Show Source):
You can put this solution on YOUR website!
                SPEED        TIME       DISTANCE
Driving          r           81%2Fr          81
hiking          r+50         2%2F%28r%2B50%29       2
Total                        2           83

Find average driving speed using equation 81%2Fr%2B2%2F%28r%2B50%29=2.

Answer by ikleyn(52798) About Me  (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?
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81%2Fr+%2B+2%2F%28r-50%29 = 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.