b2bt wrote:
Average speed concept always confuses me. Anyways there is a formula
\(Avg. Speed = \frac{2(S_1)(S_2)}{S_1+S_2}\)
\(S_1\) being one speed and \(S_2\) being another
By substituting the value you will get 75 miles/hour
Answer D
Time Taken - 1:45
Difficulty level - 600
Everyone please not you can only use this approach when the distance is same i.e., If the distance covered is constant then the average speed is Harmonic mean of the values. Else the traditional formula approach must be used.
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