Question

a train travels from station A to station B with a speed of 36 kilometre per hour and returns to A with a speed of 54 kilometre per hour. what is the average speed of the train.

Answer 1

Average of speed of train
$\frac{sum \: ofspeed}{no \: of \: times \: travel} \\ = \frac{36 + 54}{2} \\ = \frac{90}{2} \\ = 45kmph \: is \: the \: average \: speed \: of \: train$
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