Question

A bus travels a distance of 120 km with a speed of 40 km per hour and returns with a speed of 30 km/h. calculate the average speed for the entire journey.

Answer 1

Hii..
Here is your answer..

Solution:-
Total distance=120+120=240m
We know that,
Time =D/S
Time1=120/40
Time2=120/30

Now,
$average \: speed = \frac{total \: distance}{total \: time} \\ = > \frac{240}{ \frac{120}{40} + \frac{120}{30} }$
$= > \frac{240}{ \frac{360 + 480}{120} }$
$= > \frac{240}{ \frac{840}{120} }$
$= > \frac{240 \times 120}{840} \\ = > \frac{28800}{840} \\ = > 34.28$
Hence,
Average speed is 34.28km/h

Hope it helps uh...✌️✌️✌️