Question

You drive to the store at 20 kmph and return by the same route at 30 kmph. Discounting the time spent at the store, what was your average speed ?

Answer 1

$\huge{Hey Mate!!!}$

☆☞ Here is ur answer ☜☆

✔✔ Average speed=total distance/total time

Let distance to store be  K

then, total time =(K/20)+(K/30)=K/12
and, total time =(2K)

✔✔ so average speed= 2K / (K/12) = 24kmph.

HOPE IT HELPS!

Answer 2

$\huge\boxed{\texttt{\fcolorbox{Red}{aqua}{Hey Mate!!!!}}}$

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Here is your answer.
Let the distance between start point and store is x km
Speed go to store is 20 km/ hr
Time = Distance/Speed
$= \frac{x}{20} hrs$
Speed for return back = 30 km/ hr
Distance = x km
Time = Distance/speed
$= \frac{x}{30} hrs$
Now Total Distance = x+ x = 2x
Total Time
$= \frac{x}{20} + \frac{x}{30} \\ = \frac{3x + 2x}{60} \\ = \frac{5x}{60} \\ = \frac{x}{12} hrs$
Now Average Speed = Total Distance/Total Time
$= \frac{2x}{ \frac{x}{12} } \\ = 2 \times 12 \\ = 24 \: km \: per \: hrs$
Average Speed is 24 km / hrs
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