Question

a car travels 30 km at a uniform speed of 40 km/ hour and the 30 km at uniform motion speed 20 km/h . find its average speed.40

Answer 1

Here,
It's given that distance traveled = 30
And the 2nd half distance covered = 30km

So,
Total distance traveled = 60km

Now, as you know
Speed = distance /time ( if we replace distance and time)
Time = distance/speed

Now,
1st half the time = 30/40 = 3/4
And 2nd half the time = 30/20 = 3/2

So,
Total Time = 3/4 + 3/2 = 9/4

Now,
Average speed = total distance /total time
= 60 ÷ 9/4
= 80/3
=26.67km/h

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