Question

A car travels at a speed of 80 km/h during the first half of its running timeand at 40km/h during other half find the average speed of the car

Answer 1

we know that average speed=V1+V2/2

where V1=80kmph

V2=40kmph

average speed = 80+40/2

=120/2

=60kmph


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Answer 2

Speed of the car during the first half = 80 km/hr 
Speed of the car during the second half = 40 km/hr

Hence, the average speed will be - 80 + 40/ 2
That is, 120/2 = 60 km/hr .

Hope this answer helps you