Question

a car went up the hill at a speed of 16km/h and came down the same distance at a speed of 32km/h of the round trip is​

Answer 1

Answer:

21.33333km

Step-by-step explanation:

The average speed is the ratio of total traveled distance to total time taken.

Let d be the total distance traveled by the car.

Thus distance traveled in each journey is d/2.

So, the time taken for going up the hill  is t₁=  $\frac{d/2}{v_{1} } = \frac{d/2}{16} = \frac{d}{32}$

Time taken for going down the hill is t₂=  $\frac{d/2}{32} = \frac{d}{64}$

Thus, average speed is $v_{avg}$=  $\frac{L}{t_{1}+t_{2}} = \frac{L}{L/32+ L/64}$

=21.33333km

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