Question

A car moves through 120 km at a speed of 40km/hr and returns back at a speed of 60km/hr. calculate it's average speed.

Answer 1

Hey user !!

Here's the answer you are looking for

For the 1st journey,
distance travelled = 120km
speed = 40km/hr

$So, \: time \: taken = \frac{120}{40} = 3 \: hrs.$

For the return journey,
distance travelled = 120km
speed = 60km/hr

$So, \: time \: taken = \frac{120}{60} = 2 \: hrs.$

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$Average \: speed = \frac{total \: distance \: travelled}{total \: time \: taken}$

So,
$average \: speed = \frac{120 \: + \: 120}{2 \: + \: 3} \\ \\ = \frac{240}{5} \\ \\ = 48km {hr}^{ - 1}$

Therefore, the average speed is 48km/hr.



★ HOPE THAT HELPS ☺️ ★