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The time it took car A to travel 400 miles was 2 hours less [#permalink]
22 Nov 2006, 23:57
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The time it took car A to travel 400 miles was 2 hours less than the time it took car B to travel the same distance. If car Aâ€™s average speed was 10 miles per hour greater than that of car B, what was car Bâ€™s average speed, in miles per hour? (A) 20 (B) 30 (C) 40 (D) 50 (E) 80
can easily be found out by backsolving....but whats the best and fastest way of doing this?