Let speed be s and time t. The conditions give (s + 6)(t − 6) = st and (s − 4)(t + 6) = st, simplifying to t − s = 6 and 3s − 2t = 12. Solving yields ...
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Let speed be s and time t. The conditions give (s + 6)(t − 6) = st and (s − 4)(t + 6) = st, simplifying to t − s = 6 and 3s − 2t = 12. Solving yields ...