Question

A car travels in straight line from A to B with constant speed of 15kmph in the return journey first half of journey time with constant speed of 20kmph and the next half with 30kmph what will be the average speed of the total journey

Answer 1

Answer:

$a - - - - - - - - - - - - b \\ speed \: from \: ab \: = 15 \frac{km}{h} \\ \\ average \: speed \: of \: ba - \\ \frac{30 +20}{2} = \frac{50}{2} = 25 \frac{km}{h} \\ \\ average \: speed \: from \: ab \: and \: ba \: - \\ \frac{15 + 25}{2} = \frac{40}{2} = 20 \frac{km}{h}$

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THE AVERAGE SPEED OF WHOLE JOURNEY IS

20 km/h