Concept explainers
To calculate:The speed of Mark and Carole.
Answer to Problem 12MPS
Mark wasdriving with an average speed of 84 mph.
Carole was driving with an average speed of 82 mph.
Explanation of Solution
Given information:
At 3:00 p.m. Mark left Pittsburgh and drove 208km towards Cleveland.
At 3:30 p.m. Carole left Cleveland and headed towards Pittsburgh at a rate of 2km/h slower than Mark.
Their car passes each other at 4:30 p.m.
Formula used:
Calculation:
Let us assume,
Mark’s average rate =v
Carole’s average rate=
The sum of the distance that each of them drove=d=208km
From
Therefore,
Since,
So,Mark wasdriving with an average speed of 84 mph and,
Carole was driving with an average speed of 82 mph.
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