Question

A train covered k km at 40 kmph and another 2k km at 20 kmph. Find the average speed of the train in covering the entire 3k km ?

Answer 1

$\huge{Hey Mate!!!}$

☆☞ Here is ur answer ☜☆

✔✔ Total time taken = k/40 + 2k/20 hours

= 5k/40 = k/8 hours

✔✔ Average speed = 3k/(k/8) = 24 kmph.



HOPE IT HELPS!

Answer 2

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

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Here is your answer.
For First train
Distance = k km
Speed = 40 km/ hr
Time = Distance/ speed
$= \frac{k}{40} hr$
For second train
Distance = 2k km
Speed = 20 km/ hr
Time =
$= \frac{2k}{20} \\ = \frac{k}{10} hr$
Now Total Distance = 3 k km
Total Time = k/40+ k/10
$\frac{k}{40} + \frac{k}{10} \\ = \frac{k + 4k}{40} \\ = \frac{5k}{40} \\ = \frac{k}{8} \: hr$

Average Speed= Total Distance/Total Time
$= \frac{3k}{ \frac{k}{8} } \\ = 3 \times 8 \\ = 24 \: \: km \: per \: hr$
Average Speed of the train to cover entire distance is 24 km/ hr.

$\large{\red{\boxed{\boxed{\boxed{\boxed{\boxed{\boxed{\boxed{\boxed{\boxed{\boxed{\underline{\underline{\underline{Hope\:it\: helps\: you}}}}}}}}}}}}}}}$