Question

A car travelled the first half of its journey
at 40 km/h and the next half at 60 km/h.
Find the average speed of the car over the
whole journey.​

Answer 1

Answer:

the answer is 100km/h

Explanation:

to know the speed of car we should add :

40 and 60 the answers 100

Answer 2

Answer:

48km/h

Explanation:

Average speed is total distance travelled divided by total time taken.

Let the distance travelled is 2x or half of distance is x.

The first half of distance x is travelled with speed of 40km/hr , so time taken is x/40hr.

Similarly time taken to travel remaining x km is at speed of 60km/hr, so time taken for this 2nd half of distance is x/60.

Now, total time taken to travel 2x distance is x/40+x/60 hr or 3x/120+2x/120hr or 5x/120 hr or x/24 hr.

The average speed of car is 2x/x/24 or 2*24 km/hr or 48km/hr.