Question

a motor cyclist drives from a to b with a speed of 30 km/hr and return back with a speed of 60 km/hr find its average speed plz answer past it is very urgentl

Answer 1

Answer:

40km/hr

Explanation:

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here, the bike travels from A to B and returns to A itself. so, distances are same in both cases,

and we can use the harmonic mean equation to find average speed. i.e,

$avg.speed = \frac{2v1v2}{v1 + v2} \\ \: \: = \frac{2 \times 60 \times 30}{60 + 30} \\ \: \: = 40$

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hope it helps...!!!