Question

A car travels at a speed of 40km/hr for 2 hrs and then at 60km/hr for 3 hrs. What is the average speed of the car during the entire journey?

Answer 1

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speed=distance/travel time
distance=2*40+60*3
              =80+180
              =260 km
travel time=2+3=5 hrs
∴ average speed during the whole journey=260/5
                                                                   =52 km/h
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Answer 2

Here, there are 2 speeds given.

So,we must find the sum of distance and the time given.

Speed 1=distance 1/time 1.
40=distance 1/2.
2(40)=distance 1.
80km=distance 1.

Speed 2=distance 2/time 2.
60=distance 2/3.
3(60)=distance 2.
180km= distance 2.

Average speed=Total distance/total time.
=distance 1+distance 2/time 1/time2.
=80km+180km/2h+3h.
=260km/5h.
=52 km/h.

Therefore,the average speed of the car during the entire journey is 52 km/h.