Question

plz tell the ans fast​

Answer 1

Answer:

40+60= 100 /2 =50

Explanation:

avg. speed = total speed/2

Answer 2

Explanation:

Given :-

Speed in the forward direction, v₁ = 60 km/h

Speed during the return journey, v₂ = 40 km/h

To Calculate :-

Average speed, v(avg) = ??

Formula to be used :-

v(avg) = Total distance/Total time taken

Solution :-

Now, in this case we are neither given the total distance nor the total time taken.

Let us say the distance traveled in the forward direction be x

Total distance, d = x + x = 2x

Time taken during forward journey, t₁ = x/60 h

Time taken during the return journey, t₂ = x/40 h

Total time taken, t = x/60 + x/40 = 5x/120 h

Now,

v(avg) = Total distance/Total time taken

⇒ v(avg) = 2x/5x/120

⇒ v(avg) = 2x × 120/5x

⇒ v(avg) = 240/5

⇒ v(avg) = 48 km/h

Hence, the average speed of the whole journey is 48 km/h.

Hope this helps :D

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