SureMath - the math software for 21st century problem solving - was used to solve this problem.
The solution above is a concept based solution. It starts with a concept (distance is velocity X time). The given material is used as it is requested by the equations. This leads to reliable problem solving and inbeds the concept the problem is meant to illustrate. The concept has a primary position in the solution.
The following solution is a given-material based solution. The solution starts with one of the given conditions. The solution is still developed step by step by responding to what the successive equations ask for. The concept, which is the reason for exercising with the problem, has a secondary position. This does not lead to reliable problem solving nor appreciaton of concepts. Working problems in the manner shown in the second solution leads to trying to solve problems by trial and error by manipulating the given material.
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The problem solution was developed by Howard C. McAllister using SureMath.