Question

A car travels first 300 kms at an average rate of 60 kmph and further travels the same distance at an average rate of 40 kmph. Determine the average speed of the car over the whole journey.

Answer 1

$\LARGE \: Hey \: User!!! \:$

According to the question, A car travels first 300 kms at an average rate of 60 kmph and further travels the same distance at an average rate of 40 kmph.

we have to find the average speed of the car over the whole journey.

so for the 300kms, the speed was 60km/h

we all know speed = distance/time

therefore 60km/h = 300km/time
>> time = 300/60
>> time = 5 hours

for the next 300kms, the speed was 40km/h

>> 40km/h = 300/time
>> time = 300/40
>> time = 7.5 hours

hence, average speed of the car over the whole journey = (total distance travelled)/(total time taken)
= (300 + 300)/(5 + 7.5)
= 600/12.5
= 48km/h

$\bf \LARGE \it Cheers!!!$